{"product_id":"caleffi-robocal-3-8-inch-automatic-air-vent-float-with-automatic-shut-off-cock-502530","title":"Caleffi Robocal 3 8 inch Automatic Air Vent Float with Automatic Shut-off Cock 502530","description":"\u003cdiv style=\"font-size:16px; max-width:900px; font-family:Arial,Helvetica,sans-serif; color:#222; line-height:1.6;\"\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eCaleffi ROBOCAL Series 5025 Automatic Air Vent with Integral Automatic Shut-off Cock (MPN 502530)\u003c\/strong\u003e is a \u003cstrong\u003e3\/8\" BSP male-threaded float-type automatic air vent\u003c\/strong\u003e distinguished by its \u003cstrong\u003ebuilt-in automatic shut-off cock\u003c\/strong\u003e. When the vent body is unscrewed from its base, an \u003cstrong\u003eEPDM O-ring-sealed piston closes automatically\u003c\/strong\u003e, isolating water flow without any manual valve operation or system drain-down. This makes the 502530 the preferred choice wherever routine vent maintenance is anticipated. The Series 5025 features a \u003cstrong\u003ehorizontal discharge\u003c\/strong\u003e orientation and is rated to \u003cstrong\u003e10 bar \/ 110°C\u003c\/strong\u003e, with a maximum discharge pressure of 4 bar.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#008377CF; border-radius:6px; padding:18px 12px; display:flex; flex-wrap:wrap; justify-content:space-around; margin:18px 0;\"\u003e\n\u003cdiv style=\"text-align:center; padding:0 16px;\"\u003e\n\u003cdiv style=\"font-size:22px; font-weight:700; color:#fff;\"\u003e10 bar\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px; color:#ddf4f2; text-transform:uppercase; letter-spacing:.5px;\"\u003eMax Pressure\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align:center; padding:0 16px;\"\u003e\n\u003cdiv style=\"font-size:22px; font-weight:700; color:#fff;\"\u003e110°C\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px; color:#ddf4f2; text-transform:uppercase; letter-spacing:.5px;\"\u003eMax Temp\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align:center; padding:0 16px;\"\u003e\n\u003cdiv style=\"font-size:22px; font-weight:700; color:#fff;\"\u003e3\/8\"\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px; color:#ddf4f2; text-transform:uppercase; letter-spacing:.5px;\"\u003eBSP Male\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align:center; padding:0 16px;\"\u003e\n\u003cdiv style=\"font-size:22px; font-weight:700; color:#fff;\"\u003eAuto Shut-off\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px; color:#ddf4f2; text-transform:uppercase; letter-spacing:.5px;\"\u003eIntegral Cock\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align:center; padding:0 16px;\"\u003e\n\u003cdiv style=\"font-size:22px; font-weight:700; color:#fff;\"\u003e4 bar\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px; color:#ddf4f2; text-transform:uppercase; letter-spacing:.5px;\"\u003eMax Discharge\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"border-left:4px solid #008377; background:#f0faf9; border-top:1px solid #b2e0db; border-right:1px solid #b2e0db; border-bottom:1px solid #b2e0db; border-radius:0 6px 6px 0; padding:12px 16px; margin:10px 0;\"\u003e\n\u003cstrong style=\"color:#008377;\"\u003eThe Key Feature: Automatic Shut-off\u003c\/strong\u003e\u003cbr\u003eWhen the vent body is unscrewed from the base for inspection or replacement, a spring-loaded \u003cstrong\u003eEPDM O-ring-sealed piston closes automatically\u003c\/strong\u003e — stopping water flow at that connection without any manual valve. This allows vent servicing without isolating the circuit or draining the system.\u003c\/div\u003e\n\u003cdiv style=\"border-left:4px solid #b7660a; background:#fffbf0; border-top:1px solid #ffe6b3; border-right:1px solid #ffe6b3; border-bottom:1px solid #ffe6b3; border-radius:0 6px 6px 0; padding:12px 16px; margin:10px 0;\"\u003e\n\u003cstrong style=\"color:#b7660a;\"\u003eDischarge Pressure Rating\u003c\/strong\u003e\u003cbr\u003eSeries 5025 (502530) is rated to a max discharge pressure of \u003cstrong\u003e4 bar\u003c\/strong\u003e. This is lower than Series 5026 (6 bar). Verify system pressure at the installation point is within this limit before specifying.\u003c\/div\u003e\n\u003cdiv style=\"border-left:4px solid #c0392b; background:#fff5f5; border-top:1px solid #ffd5d5; border-right:1px solid #ffd5d5; border-bottom:1px solid #ffd5d5; border-radius:0 6px 6px 0; padding:12px 16px; margin:10px 0;\"\u003e\n\u003cstrong style=\"color:#c0392b;\"\u003eInstallation Orientation\u003c\/strong\u003e\u003cbr\u003eMust be installed \u003cstrong\u003evertically upright\u003c\/strong\u003e. The float mechanism operates on gravity — tilted or inverted installation will prevent correct operation.\u003c\/div\u003e\n\n\u003cdiv style=\"font-size:18px; font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:6px; margin:24px 0 12px 0;\"\u003eKey Features\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; gap:14px; margin:18px 0;\"\u003e\n\u003cdiv style=\"flex:1 1 260px; min-width:220px;\"\u003e\u003cdiv style=\"border:1px solid #e0e0e0; border-radius:8px; padding:16px; background:#fff;\"\u003e\n\u003cdiv style=\"font-size:24px; margin-bottom:8px;\"\u003e🔒\u003c\/div\u003e\n\u003cdiv style=\"font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:4px; margin-bottom:8px;\"\u003eAutomatic Shut-off on Removal\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#444;\"\u003eThe integral shut-off cock closes the moment the vent body is unscrewed — \u003cstrong\u003eno manual valve to remember to close\u003c\/strong\u003e, and no risk of water discharge during vent removal. EPDM O-rings provide long-term seal reliability.\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; min-width:220px;\"\u003e\u003cdiv style=\"border:1px solid #e0e0e0; border-radius:8px; padding:16px; background:#fff;\"\u003e\n\u003cdiv style=\"font-size:24px; margin-bottom:8px;\"\u003e🫧\u003c\/div\u003e\n\u003cdiv style=\"font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:4px; margin-bottom:8px;\"\u003eFloat-Type Auto Venting\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#444;\"\u003eAir accumulates in the body → float falls → obturator opens → air vents. Water replaces air → float rises → obturator seals. The same proven Robocal float mechanism as the standard Series 5026.\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; min-width:220px;\"\u003e\u003cdiv style=\"border:1px solid #e0e0e0; border-radius:8px; padding:16px; background:#fff;\"\u003e\n\u003cdiv style=\"font-size:24px; margin-bottom:8px;\"\u003e🛡\u003c\/div\u003e\n\u003cdiv style=\"font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:4px; margin-bottom:8px;\"\u003eDry Obturator\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#444;\"\u003eThe obturator seal is positioned away from direct contact with system water, preventing contamination from sludge, magnetite, and scale that would otherwise degrade the seal over time.\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; min-width:220px;\"\u003e\u003cdiv style=\"border:1px solid #e0e0e0; border-radius:8px; padding:16px; background:#fff;\"\u003e\n\u003cdiv style=\"font-size:24px; margin-bottom:8px;\"\u003e↔️\u003c\/div\u003e\n\u003cdiv style=\"font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:4px; margin-bottom:8px;\"\u003eHorizontal Discharge\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#444;\"\u003eThe Series 5025 vents horizontally — well-suited to locations where vertical clearance above the vent connection is restricted, or where the discharge direction must be directed away from sensitive components.\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin:18px 0;\"\u003e\n\u003cdiv style=\"background:#008377CF; color:#fff; font-weight:700; padding:10px 14px; border-radius:6px 6px 0 0;\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse; border:1px solid #d0eeec;\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#f4fcfb;\"\u003eMPN\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#f4fcfb;\"\u003e502530\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#fff;\"\u003eSeries\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#fff;\"\u003e5025 — ROBOCAL with Automatic Shut-off Cock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#f4fcfb;\"\u003eConnection\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#f4fcfb;\"\u003e3\/8\" BSP Male (external thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#fff;\"\u003eDischarge Direction\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#fff;\"\u003eHorizontal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#f4fcfb;\"\u003eBody \/ Cover Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#f4fcfb;\"\u003eBrass EN 12165 CW617N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#fff;\"\u003eFloat Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#fff;\"\u003ePolypropylene (PP)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#f4fcfb;\"\u003eObturator Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#f4fcfb;\"\u003eSilicone rubber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#fff;\"\u003eSpring Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#fff;\"\u003eStainless steel 1.4310 \/ AISI 302\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#f4fcfb;\"\u003eSeals — body\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#f4fcfb;\"\u003eEPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#fff;\"\u003eSeals — shut-off cock\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#fff;\"\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#f4fcfb;\"\u003eMedium\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#f4fcfb;\"\u003eWater; glycol solutions max 30%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#fff;\"\u003eMax Working Pressure\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#fff;\"\u003e10 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#f4fcfb;\"\u003eMax Discharge Pressure\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#f4fcfb;\"\u003e4 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#fff;\"\u003eMax Working Temperature\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#fff;\"\u003e110°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#f4fcfb;\"\u003eBody Dimensions (approx.)\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#f4fcfb;\"\u003eHeight 72mm; Body diameter Ø40mm; D: 25mm; E: 57mm; F: 10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#fff;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#fff;\"\u003eapprox. 0.167 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 12px; width:50%; font-weight:600; background:#f4fcfb;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; background:#f4fcfb;\"\u003eCaleffi S.p.A., Italy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"font-size:18px; font-weight:700; color:#008377; border-bottom:2px solid #008377; padding-bottom:6px; margin:24px 0 12px 0;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdiv style=\"margin:18px 0;\"\u003e\n\u003cdetails style=\"border:1px solid #d0eeec; border-radius:6px; margin-bottom:8px; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#fff; padding:12px 16px; cursor:pointer; font-weight:600; list-style:none;\"\u003eWhat is the key difference between 502530 and 502630?\u003c\/summary\u003e\u003cdiv style=\"padding:14px 16px; background:#f9fefe; font-size:15px;\"\u003e502530 (Series 5025): 3\/8\" BSP, horizontal discharge, \u003cstrong\u003eintegral automatic shut-off cock\u003c\/strong\u003e, 4 bar max discharge pressure, 110°C max. 502630 (Series 5026): 3\/8\" or ½\" BSP, vertical discharge, no shut-off cock, 6 bar max discharge pressure, 115°C max. Choose 502530 where maintenance access and serviceability are priorities.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #d0eeec; border-radius:6px; margin-bottom:8px; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#fff; padding:12px 16px; cursor:pointer; font-weight:600; list-style:none;\"\u003eCan I service this vent without draining the heating system?\u003c\/summary\u003e\u003cdiv style=\"padding:14px 16px; background:#f9fefe; font-size:15px;\"\u003eYes — this is the primary advantage of the 5025 series. Unscrewing the vent body activates the automatic shut-off, stopping water at that point. You can remove, inspect, and replace the vent without draining or isolating the wider circuit.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #d0eeec; border-radius:6px; margin-bottom:8px; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#fff; padding:12px 16px; cursor:pointer; font-weight:600; list-style:none;\"\u003eWhat size fitting does the 502530 need?\u003c\/summary\u003e\u003cdiv style=\"padding:14px 16px; background:#f9fefe; font-size:15px;\"\u003e3\/8\" BSP male (external thread). Common installation positions include buffer vessel tappings, boiler manifold connections, and proprietary system ports with 3\/8\" female tappings. Confirm the thread size at your installation point before ordering.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #d0eeec; border-radius:6px; margin-bottom:8px; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#fff; padding:12px 16px; cursor:pointer; font-weight:600; list-style:none;\"\u003eIs this vent suitable for solar thermal systems?\u003c\/summary\u003e\u003cdiv style=\"padding:14px 16px; background:#f9fefe; font-size:15px;\"\u003eProvided the operating temperature and pressure remain within the rated limits (10 bar, 110°C), and glycol concentration does not exceed 30%, the 502530 is compatible with solar thermal primary circuits. However, at high solar temperatures (above 100°C), consult the system designer — some solar primary circuits operate above the 110°C rating of the 5025 series.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #d0eeec; border-radius:6px; margin-bottom:8px; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#fff; padding:12px 16px; cursor:pointer; font-weight:600; list-style:none;\"\u003eDoes the 502530 need an additional isolation valve?\u003c\/summary\u003e\u003cdiv style=\"padding:14px 16px; background:#f9fefe; font-size:15px;\"\u003eNo — the integral automatic shut-off cock fulfils the isolation function during vent removal. An upstream isolation valve is not required for routine maintenance, though one may be desirable for full circuit isolation during commissioning or system drain-down.\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Caleffi","offers":[{"title":"Default Title","offer_id":64955245232477,"sku":"502530","price":12.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/CaleffiRobocal38inchAutomaticAirVentFloatwithAutomaticShut-offCock502530.jpg?v=1781190565","url":"https:\/\/qualityheating.co.uk\/products\/caleffi-robocal-3-8-inch-automatic-air-vent-float-with-automatic-shut-off-cock-502530","provider":"AIZO Quality Heating","version":"1.0","type":"link"}