{"product_id":"altecnic-istop-28mm-anti-freeze-valve","title":"Altecnic iStop Anti-Freeze Valve 28mm Compression | 108301","description":"\u003c!-- SEO Product Name: Altecnic iStop Anti-Freeze Valve 28mm Compression | 108301 --\u003e\n\u003cdiv style=\"font-size:16px; max-width:900px; color:#222222; line-height:1.6;\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eAltecnic iStop anti-freeze valve with 28mm compression ends\u003c\/strong\u003e (\u003cstrong\u003e108301\u003c\/strong\u003e) protects heat pump pipework from freezing by \u003cstrong\u003edraining the circuit medium when the temperature falls to an average of 3°C\u003c\/strong\u003e. This prevents ice forming in the circuit, \u003cstrong\u003eavoiding damage to equipment, valves and pipework\u003c\/strong\u003e. It is offered as an \u003cstrong\u003ealternative frost prevention measure\u003c\/strong\u003e to be installed with \u003cstrong\u003eVaillant aroTHERM plus heat pumps\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe valve \u003cstrong\u003eopens at 3°C\u003c\/strong\u003e and \u003cstrong\u003ecloses again at 4°C\u003c\/strong\u003e (accuracy ±1°C), and is built from \u003cstrong\u003ebrass\u003c\/strong\u003e with \u003cstrong\u003estainless steel springs\u003c\/strong\u003e and \u003cstrong\u003eEPDM seals\u003c\/strong\u003e. Both the \u003cstrong\u003evacuum breaker\u003c\/strong\u003e and the \u003cstrong\u003ethermostatic cartridge\u003c\/strong\u003e can be replaced, with an \u003cstrong\u003eautomatic shut-off cock\u003c\/strong\u003e keeping the system pressurised during replacement.\u003c\/p\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; gap:10px; margin:20px 0;\"\u003e\n\u003cdiv style=\"flex:1 1 130px; background:#ffffff; border:2px solid #008377CF; border-top:6px solid #008377CF; border-radius:8px; padding:12px 8px; text-align:center;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:700; color:#008377CF; line-height:1.2;\"\u003e3°C\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px; color:#333333; margin-top:4px;\"\u003eOpening temperature\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 130px; background:#ffffff; border:2px solid #008377CF; border-top:6px solid #008377CF; border-radius:8px; padding:12px 8px; text-align:center;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:700; color:#008377CF; line-height:1.2;\"\u003e4°C\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px; color:#333333; margin-top:4px;\"\u003eClosing temperature\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 130px; background:#ffffff; border:2px solid #008377CF; border-top:6px solid #008377CF; border-radius:8px; padding:12px 8px; text-align:center;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:700; color:#008377CF; line-height:1.2;\"\u003e10 bar\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px; color:#333333; margin-top:4px;\"\u003eMax working pressure\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 130px; background:#ffffff; border:2px solid #008377CF; border-top:6px solid #008377CF; border-radius:8px; padding:12px 8px; text-align:center;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:700; color:#008377CF; line-height:1.2;\"\u003e28mm\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px; color:#333333; margin-top:4px;\"\u003eCompression ends\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 130px; background:#ffffff; border:2px solid #008377CF; border-top:6px solid #008377CF; border-radius:8px; padding:12px 8px; text-align:center;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:700; color:#008377CF; line-height:1.2;\"\u003e0 to 65°C\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px; color:#333333; margin-top:4px;\"\u003eWorking temperature\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 130px; background:#ffffff; border:2px solid #008377CF; border-top:6px solid #008377CF; border-radius:8px; padding:12px 8px; text-align:center;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:700; color:#008377CF; line-height:1.2;\"\u003e-30 to 60°C\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px; color:#333333; margin-top:4px;\"\u003eAmbient temperature\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left:6px solid #C62828; background:#FDECEA; border-radius:8px; padding:14px 16px; margin:12px 0;\"\u003e\n\u003cdiv style=\"font-weight:700; color:#C62828; margin-bottom:4px;\"\u003eCorrect installation is essential\u003c\/div\u003e\n\u003cdiv style=\"line-height:1.5; color:#222222;\"\u003eFit the valve \u003cstrong\u003evertically with the outlet facing down\u003c\/strong\u003e, outdoors and clear of heat sources. Install on \u003cstrong\u003eboth flow and return pipes\u003c\/strong\u003e, make \u003cstrong\u003eno trap connections\u003c\/strong\u003e, and keep the system \u003cstrong\u003eunder pressure at all times\u003c\/strong\u003e. The valve must be \u003cstrong\u003efree of insulation\u003c\/strong\u003e. Incorrect installation removes the frost protection.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left:6px solid #E65100; background:#FFF3E0; border-radius:8px; padding:14px 16px; margin:12px 0;\"\u003e\n\u003cdiv style=\"font-weight:700; color:#E65100; margin-bottom:4px;\"\u003eHeat pump compatibility\u003c\/div\u003e\n\u003cdiv style=\"line-height:1.5; color:#222222;\"\u003eListed as an alternative frost prevention measure for \u003cstrong\u003eVaillant aroTHERM plus\u003c\/strong\u003e heat pumps. Always confirm the requirements in the heat pump manufacturer's installation instructions.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left:6px solid #008377CF; background:#0083771A; border-radius:8px; padding:14px 16px; margin:12px 0;\"\u003e\n\u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:4px;\"\u003eDrain and clearances\u003c\/div\u003e\n\u003cdiv style=\"line-height:1.5; color:#222222;\"\u003eLeave \u003cstrong\u003eat least 15cm\u003c\/strong\u003e clearance from the ground, keep \u003cstrong\u003eat least 10cm\u003c\/strong\u003e between valves, route the drain to a suitable collection point, and protect the valve from rain, snow and direct sunlight.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size:20px; color:#008377CF; border-bottom:3px solid #008377CF; padding-bottom:6px; margin:28px 0 12px 0;\"\u003eKey features\u003c\/h3\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; gap:12px;\"\u003e\n\u003cdiv style=\"flex:1 1 260px; background:#0083771A; border-left:6px solid #008377CF; border-radius:8px; padding:14px 16px;\"\u003e\n\u003cdiv style=\"font-size:16px; font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eAutomatic frost protection\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#222222; line-height:1.5;\"\u003eDrains the circuit when the medium reaches an average of \u003cstrong\u003e3°C\u003c\/strong\u003e and \u003cstrong\u003ecloses at 4°C\u003c\/strong\u003e.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; background:#0083771A; border-left:6px solid #008377CF; border-radius:8px; padding:14px 16px;\"\u003e\n\u003cdiv style=\"font-size:16px; font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eBrass construction\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#222222; line-height:1.5;\"\u003e\n\u003cstrong\u003eBrass body\u003c\/strong\u003e with \u003cstrong\u003estainless steel springs\u003c\/strong\u003e and \u003cstrong\u003eEPDM seals\u003c\/strong\u003e.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; background:#0083771A; border-left:6px solid #008377CF; border-radius:8px; padding:14px 16px;\"\u003e\n\u003cdiv style=\"font-size:16px; font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003e28mm compression ends\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#222222; line-height:1.5;\"\u003e\n\u003cstrong\u003eCompression connection to BS EN 1254\u003c\/strong\u003e for direct 28mm pipework connection.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; background:#0083771A; border-left:6px solid #008377CF; border-radius:8px; padding:14px 16px;\"\u003e\n\u003cdiv style=\"font-size:16px; font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eHigh flow\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#222222; line-height:1.5;\"\u003e\n\u003cstrong\u003eKv of 55 m³\/h\u003c\/strong\u003e through the straight path.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; background:#0083771A; border-left:6px solid #008377CF; border-radius:8px; padding:14px 16px;\"\u003e\n\u003cdiv style=\"font-size:16px; font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eServiceable cartridge\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#222222; line-height:1.5;\"\u003e\n\u003cstrong\u003eReplaceable vacuum breaker and thermostatic cartridge\u003c\/strong\u003e, with an automatic shut-off cock.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; background:#0083771A; border-left:6px solid #008377CF; border-radius:8px; padding:14px 16px;\"\u003e\n\u003cdiv style=\"font-size:16px; font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eLow discharge rate\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#222222; line-height:1.5;\"\u003eDischarge of \u003cstrong\u003e0.5 l\/h at -5°C\u003c\/strong\u003e and \u003cstrong\u003e1 l\/h at -20°C\u003c\/strong\u003e (at 3 bar).\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size:20px; color:#008377CF; border-bottom:3px solid #008377CF; padding-bottom:6px; margin:28px 0 12px 0;\"\u003eTechnical specification\u003c\/h3\u003e\n\u003cdiv style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:8px 12px; margin-top:10px; border-radius:6px 6px 0 0;\"\u003eGeneral\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#008377CF; color:#ffffff; font-weight:700;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:10px 12px;\"\u003eParameter\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:10px 12px;\"\u003eSpecification\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eBrand\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003eAltecnic (iStop)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083771A; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eReference\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003e108301\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eConnection size\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003e28mm compression\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083771A; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eMedium\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003eWater\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eConnection standard\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003eCompression to BS EN 1254\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:8px 12px; margin-top:10px; border-radius:6px 6px 0 0;\"\u003ePerformance\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#008377CF; color:#ffffff; font-weight:700;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:10px 12px;\"\u003eParameter\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:10px 12px;\"\u003eSpecification\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eMedium temperature, opening\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003e3°C\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083771A; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eMedium temperature, closing\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003e4°C\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eAccuracy\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003e±1°C\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083771A; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eMaximum working pressure\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003e10 bar\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eWorking temperature range\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003e0 to 65°C\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083771A; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eAmbient temperature range\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003e-30 to 60°C\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eKv, straight path\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003e55 m³\/h\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083771A; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eDischarge at 3 bar, -5°C\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003e0.5 l\/h\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eDischarge at 3 bar, -20°C\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003e1 l\/h\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:8px 12px; margin-top:10px; border-radius:6px 6px 0 0;\"\u003eMaterials\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#008377CF; color:#ffffff; font-weight:700;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:10px 12px;\"\u003eParameter\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:10px 12px;\"\u003eSpecification\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eBody\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003eBrass, BS EN 12164 CW724R\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083771A; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eObturator\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003eBrass, BS EN 12164 CW617N\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eSprings\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003eStainless steel, BS EN 10270-3 (AISI 302)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083771A; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eSeals\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003eEPDM\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eCompression nut\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003eBrass, BS EN 12165 CW617N\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083771A; border-bottom:1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex:1 1 90px; padding:9px 12px; font-weight:700; color:#008377CF;\"\u003eOlive\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 90px; padding:9px 12px; color:#222222;\"\u003eBrass, BS EN 12164 CW614N\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size:20px; color:#008377CF; border-bottom:3px solid #008377CF; padding-bottom:6px; margin:28px 0 12px 0;\"\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cdetails style=\"margin:8px 0; border:2px solid #008377CF; border-radius:8px; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:12px 16px; cursor:pointer;\"\u003eHow does the valve work?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 16px; line-height:1.55; color:#222222;\"\u003eWhen the water in the pipe drops below \u003cstrong\u003e3°C\u003c\/strong\u003e the obturator opens and drains water off. It \u003cstrong\u003ecloses when the medium returns to 4°C\u003c\/strong\u003e.\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails style=\"margin:8px 0; border:2px solid #008377CF; border-radius:8px; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:12px 16px; cursor:pointer;\"\u003eDo I need one on both pipes?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 16px; line-height:1.55; color:#222222;\"\u003eYes. Fit valves on \u003cstrong\u003eboth the flow and return pipes\u003c\/strong\u003e, otherwise water may be left in one pipe which could freeze.\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails style=\"margin:8px 0; border:2px solid #008377CF; border-radius:8px; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:12px 16px; cursor:pointer;\"\u003eWhere should it be installed?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 16px; line-height:1.55; color:#222222;\"\u003e\n\u003cstrong\u003eOutdoors\u003c\/strong\u003e, where the lowest temperatures are reached if the heat pump is not operating, \u003cstrong\u003evertically with the outlet facing down\u003c\/strong\u003e and away from heat sources.\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails style=\"margin:8px 0; border:2px solid #008377CF; border-radius:8px; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:12px 16px; cursor:pointer;\"\u003eShould the valve be insulated?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 16px; line-height:1.55; color:#222222;\"\u003eNo. The valve must be \u003cstrong\u003efree of insulation\u003c\/strong\u003e for the system to work properly, and protected from rain, snow and direct sunlight.\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails style=\"margin:8px 0; border:2px solid #008377CF; border-radius:8px; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:12px 16px; cursor:pointer;\"\u003eCan the cartridge be replaced?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 16px; line-height:1.55; color:#222222;\"\u003eYes. The \u003cstrong\u003evacuum breaker\u003c\/strong\u003e and \u003cstrong\u003ethermostatic cartridge\u003c\/strong\u003e can both be replaced, and an \u003cstrong\u003eautomatic shut-off cock\u003c\/strong\u003e keeps the system pressurised.\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Altecnic","offers":[{"title":"Default Title","offer_id":65606676152669,"sku":"93511","price":99.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/AltecniciStopAnti-FreezeValve28mmCompression.jpg?v=1791532120","url":"https:\/\/qualityheating.co.uk\/products\/altecnic-istop-28mm-anti-freeze-valve","provider":"AIZO Quality Heating","version":"1.0","type":"link"}