{"product_id":"amtrol-ax-40v-extrol-commercial-asme-hydronic-expansion-tank-22-gallon","title":"Amtrol AX-40V Extrol Commercial ASME Hydronic Expansion Tank (21.7 Gallon)","description":"\u003cp\u003eThe Amtrol Extrol \u003cstrong\u003eAX-40V\u003c\/strong\u003e is a commercial-grade, ASME-certified diaphragm expansion tank engineered to control pressure fluctuations in closed, non-potable hydronic heating and chilled water systems. Built with a deep-drawn steel dome design that provides greater strength than traditional head-and-shell construction, the AX-40V isolates a heavy-duty butyl\/EPDM diaphragm from system fluid to prevent waterlogging and maintain long-term pressure control.\u003c\/p\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank volume:\u003c\/strong\u003e 21.7 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum acceptance volume:\u003c\/strong\u003e 11.3 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank diameter:\u003c\/strong\u003e 16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank height:\u003c\/strong\u003e 33 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem connection:\u003c\/strong\u003e 3\/4 inch NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory pre-charge:\u003c\/strong\u003e 12 PSIG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum working pressure:\u003c\/strong\u003e 125 PSIG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum operating temperature:\u003c\/strong\u003e 240 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e ASME Section VIII, Division 1 certified steel shell, heavy-duty Butyl\/EPDM diaphragm, Schrader air valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Red oxide primer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 3-year limited\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for commercial hydronic heating loops and light commercial chilled water systems where a compact, high-strength ASME expansion tank is required.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/amtrol-extrol-ax-series-submittal-data.pdf?v=1787247605\"\u003eDownload the Amtrol Extrol AX Series submittal data sheet\u003c\/a\u003e\u003c\/p\u003e","brand":"Amtrol","offers":[{"title":"Default Title","offer_id":42965177991262,"sku":"AX-40V","price":1995.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/169581091_e033ea91-e8bd-42a3-91b3-89a7911eaac6.webp?v=1786287641","url":"https:\/\/nationalboilersupply.com\/products\/amtrol-ax-40v-extrol-commercial-asme-hydronic-expansion-tank-22-gallon","provider":"National Boiler Supply","version":"1.0","type":"link"}