{"product_id":"myson-trv22830adap-trv-head-adapter-28mm-to-30mm-m28-to-m30-radiator-valve-adaptor-fits-drayton-wiser-standard-heads","title":"Myson TRV22830ADAP TRV Head Adapter 28mm to 30mm | M28 to M30 Radiator Valve Adaptor | Fits Drayton Wiser \u0026 Standard Heads","description":"\u003cstyle\u003e\n  .my-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .my-wrap p,.my-wrap li,.my-wrap td,.my-wrap th{font-size:16px!important;line-height:1.7}\n  .my-wrap h2{font-size:22px!important;font-weight:700;color:#1a2a3a;border-bottom:3px solid #c0392b;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .my-wrap h3{font-size:17px!important;font-weight:700;color:#1a2a3a;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .my-wrap p{margin:0 0 1rem}\n  .my-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .my-wrap ul li{margin-bottom:0.5rem}\n  .my-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .my-badge.red{background:#c0392b;color:#fff}\n  .my-badge.navy{background:#1a2a3a;color:#fff}\n  .my-badge.grey{background:#555;color:#fff}\n  .my-badge.green{background:#1a7a3c;color:#fff}\n  .my-badge.orange{background:#e67e22;color:#fff}\n  .my-intro-box{background:#fef9f4;border-left:4px solid #c0392b;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .my-intro-box p{margin:0!important}\n  .my-info-box{background:#eef6ff;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .my-info-box p{margin:0 0 0.5rem!important;color:#0d47a1;font-weight:700}\n  .my-warn-box{background:#fff8e1;border:1px solid #ffe082;border-radius:5px;padding:0.8rem 1rem;margin:0.8rem 0;font-size:15px!important;color:#5a3a00}\n  .my-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .my-card{background:#fef9f4;border:1px solid #e8c5b0;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .my-card strong{display:block;color:#1a2a3a;margin-bottom:0.35rem;font-size:16px!important}\n  .my-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .my-spec-table th{background:#1a2a3a;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .my-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #ecddd5;vertical-align:top;font-size:16px!important}\n  .my-spec-table tr:nth-child(even) td{background:#fef9f4}\n  .my-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .my-faq-item{border-bottom:1px solid #e5d5d0;padding:0.9rem 0}\n  .my-faq-item:last-child{border-bottom:none}\n  .my-faq-item strong{color:#1a2a3a;font-size:16px!important;display:block;margin-bottom:0.3rem}\n\u003c\/style\u003e\n\u003cdiv class=\"my-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"my-badge red\"\u003eTRV22830ADAP\u003c\/span\u003e\n    \u003cspan class=\"my-badge navy\"\u003eM28 → M30\u003c\/span\u003e\n    \u003cspan class=\"my-badge navy\"\u003eGenuine Myson\u003c\/span\u003e\n    \u003cspan class=\"my-badge green\"\u003eNo Drain-Down Required\u003c\/span\u003e\n    \u003cspan class=\"my-badge grey\"\u003eHexagonal Head\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"my-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eMyson TRV22830ADAP\u003c\/strong\u003e — Genuine M28 to M30 TRV head adaptor  |  Allows modern 30mm TRV heads to fit pre-1997 Myson M28 valve bodies  |  Hexagonal anti-spin design  |  Fits Drayton Wiser and standard replacement heads\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eMyson TRV22830ADAP\u003c\/strong\u003e is the genuine OEM adaptor for upgrading pre-1997 Myson TRV valve bodies to accept current M30×1.5mm thermostatic heads, including smart TRVs such as the Drayton Wiser Radiator Thermostat. Myson revised their TRV thread standard from M28 to M30 in 1997, making this adaptor essential when replacing old heads on existing Myson valve bodies — with no need to drain down or disturb the pipework.\u003c\/p\u003e\n  \u003cp\u003eThe adaptor screws directly onto the existing M28 valve body. The new TRV head then screws onto the M30 male thread on top. The hexagonal profile on the upper section prevents the adaptor from spinning when the TRV head is tightened or adjusted — a key advantage over round-bodied alternatives, which can rotate and cause difficulty at installation.\u003c\/p\u003e\n  \u003cp\u003eThis is also known by the legacy part number \u003cstrong\u003e2TRVADAP\u003c\/strong\u003e and fits Myson, Westherm, Comap and similar M28 valve bodies of the same period. It is a solid, precision-machined component, not a lightweight substitute.\u003c\/p\u003e\n\n  \u003cdiv class=\"my-info-box\"\u003e\n    \u003cp\u003e💡 Compatible with Smart TRVs\u003c\/p\u003e\n    \u003cp style=\"color:#333;font-weight:400;margin:0!important\"\u003eThis adaptor allows the Drayton Wiser Smart Radiator Thermostat (WV704R0A0902) and other M30×1.5mm heads to fit onto older Myson M28 valve bodies — making it ideal for smart heating system upgrades without full valve replacement.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"my-grid\"\u003e\n    \u003cdiv class=\"my-card\"\u003e\n\u003cstrong\u003eM28 Female → M30 Male\u003c\/strong\u003eFemale M28×1.5mm thread accepts the existing Myson valve body; male M30×1.5mm thread accepts modern TRV heads — genuine Myson specification.\u003c\/div\u003e\n    \u003cdiv class=\"my-card\"\u003e\n\u003cstrong\u003eHexagonal Anti-Spin Head\u003c\/strong\u003eThe hex-profile upper section prevents the adaptor from rotating when heads are tightened or manually adjusted — avoids the common problem with round-top alternatives.\u003c\/div\u003e\n    \u003cdiv class=\"my-card\"\u003e\n\u003cstrong\u003eNo Drain-Down Required\u003c\/strong\u003eFits directly onto the existing valve body without draining the central heating system — simply remove the old head and screw on the adaptor.\u003c\/div\u003e\n    \u003cdiv class=\"my-card\"\u003e\n\u003cstrong\u003eGenuine Myson OEM Part\u003c\/strong\u003eAuthentic Myson part (TRV22830ADAP \/ 2TRVADAP) — correct thread pitch and dimensions for proper engagement and long-term reliability.\u003c\/div\u003e\n    \u003cdiv class=\"my-card\"\u003e\n\u003cstrong\u003eWide Compatibility\u003c\/strong\u003eSuitable for Myson, Westherm, Comap and other M28 valve bodies from the pre-1997 era. Also compatible with smart TRVs using the M30×1.5mm standard.\u003c\/div\u003e\n    \u003cdiv class=\"my-card\"\u003e\n\u003cstrong\u003eSolid Construction\u003c\/strong\u003ePrecision-machined metal construction — robust and durable for long-term radiator valve use in central heating systems.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"my-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eTRV22830ADAP (also 2TRVADAP)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eMyson\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eTRV head adaptor — M28 valve body to M30 head\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBottom Thread (Valve Body)\u003c\/td\u003e\n\u003ctd\u003eM28 × 1.5mm (female) — fits pre-1997 Myson TRV 2-Way valve bodies\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTop Thread (TRV Head)\u003c\/td\u003e\n\u003ctd\u003eM30 × 1.5mm (male) — accepts all standard M30 thermostatic heads\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eUpper Profile\u003c\/td\u003e\n\u003ctd\u003eHexagonal — prevents rotation during installation and adjustment\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eMetal (precision machined)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eNo drain-down required — direct replacement of existing TRV head\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompatible TRV Heads\u003c\/td\u003e\n\u003ctd\u003eAll M30 × 1.5mm heads including Drayton Wiser, standard manual TRVs\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompatible Valve Bodies\u003c\/td\u003e\n\u003ctd\u003eMyson TRV 2-Way (pre-1997), Westherm, Comap (M28 bodies)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's Included\u003c\/h2\u003e\n  \u003cdiv class=\"my-info-box\"\u003e\n    \u003cp\u003eIn the Box\u003c\/p\u003e\n    \u003cp style=\"color:#333;font-weight:400;margin:0!important\"\u003e1 × Myson TRV22830ADAP M28–M30 adaptor. \u003cem\u003eNote: TRV head and valve body are NOT included.\u003c\/em\u003e\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"my-warn-box\"\u003e\n    ⚠️ \u003cstrong\u003eAdaptor Only\u003c\/strong\u003e — This listing is for the adaptor only. A TRV valve body and TRV head are not included. Ensure your existing valve body has an M28 × 1.5mm female thread before ordering. If you are unsure, email a photograph of your existing valve for identification.\n  \u003c\/div\u003e\n\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003cp\u003eRemove the existing TRV head by unscrewing anti-clockwise. The adaptor screws clockwise onto the existing M28 valve body and can be tightened with a spanner on the hex flats. No need to drain the heating system — the valve body remains in place. Once the adaptor is fitted, the new M30 TRV head screws directly onto the M30 male thread. Check for leaks after installation and refill as necessary.\u003c\/p\u003e\n  \u003cp\u003eFor systems being upgraded to smart TRVs such as the Drayton Wiser, this adaptor avoids the cost of full valve replacement and system drain-down — saving significant time per radiator on a whole-house smart heating upgrade.\u003c\/p\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"my-faq-item\"\u003e\n\u003cstrong\u003eDo I need to drain the central heating system to fit this adaptor?\u003c\/strong\u003e\u003cp\u003eNo. The adaptor fits directly onto the existing valve body with the valve closed. Simply remove the old TRV head and screw the adaptor on in its place — no drain-down required.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"my-faq-item\"\u003e\n\u003cstrong\u003eWill this fit the Drayton Wiser Smart Radiator Thermostat?\u003c\/strong\u003e\u003cp\u003eYes. The Drayton Wiser Smart Radiator Thermostat (WV704R0A0902) uses a standard M30 × 1.5mm thread and will fit directly onto this adaptor after it is installed on the M28 valve body.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"my-faq-item\"\u003e\n\u003cstrong\u003eWhy does my Myson TRV head not fit my valve body?\u003c\/strong\u003e\u003cp\u003eMyson changed their TRV head thread from M28 to M30 in 1997. If you have a valve body installed before 1997, the newer M30 heads will not fit without this adaptor.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"my-faq-item\"\u003e\n\u003cstrong\u003eWhat is the difference between the hex-top and round-top adaptors?\u003c\/strong\u003e\u003cp\u003eThe hexagonal upper profile on the Myson TRV22830ADAP prevents the adaptor from spinning when the TRV head is tightened or turned. Round-top alternatives (often cheaper) can rotate and make installation and adjustment difficult.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"my-faq-item\"\u003e\n\u003cstrong\u003eDoes this fit Westherm or Comap valves?\u003c\/strong\u003e\u003cp\u003eYes, provided the valve body has an M28 × 1.5mm female thread — the same thread used on Myson pre-1997 bodies. This includes many Westherm and Comap bodies of the same period. If in doubt, check the thread specification on your existing valve body.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"my-faq-item\"\u003e\n\u003cstrong\u003eIs this a genuine Myson part?\u003c\/strong\u003e\u003cp\u003eYes. The TRV22830ADAP (also known as 2TRVADAP) is the genuine Myson OEM adaptor with the correct thread pitch and dimensions for a secure, leak-free fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Myson","offers":[{"title":"Default Title","offer_id":63665466540381,"sku":"TRV22830ADAP","price":13.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/myson-radiator-adapter-for-trv-28mm-to-30mm-TRV22830ADAP.webp?v=1772352422","url":"https:\/\/qualityheating.co.uk\/products\/myson-trv22830adap-trv-head-adapter-28mm-to-30mm-m28-to-m30-radiator-valve-adaptor-fits-drayton-wiser-standard-heads","provider":"AIZO Quality Heating","version":"1.0","type":"link"}