{"product_id":"hoffman-401488-model-79-water-main-vent-valve","title":"Hoffman 401488 Model 79 Water Main Vent Valve","description":"\u003cp\u003eEfficiently remove unwanted air from hydronic heating systems with the \u003cstrong\u003eHoffman 401488 Model 79\u003c\/strong\u003e water main vent valve. Designed for high-capacity air release, this professional-grade component prevents air locks and improves circulation to ensure consistent heat distribution across your piping network.\u003c\/p\u003e\u003cp\u003eThe internal mechanism utilizes a precision-engineered float and needle valve assembly that automatically discharges air while maintaining a tight seal against water leakage. As air accumulates within the valve chamber, the float drops, opening the port to vent the air; once the system is filled with water, the float rises to securely close the valve.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision venting:\u003c\/strong\u003e Automatically expels air from mains and heat exchangers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeak-resistant seal:\u003c\/strong\u003e High-tolerance needle valve construction ensures drip-free operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust durability:\u003c\/strong\u003e Built to withstand standard hydronic system operating pressures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy installation:\u003c\/strong\u003e Designed for standard main line integration.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for residential and light commercial closed-loop hydronic heating systems, specifically installed at high points or main headers to optimize flow performance.\u003c\/p\u003e","brand":"Hoffman","offers":[{"title":"Default Title","offer_id":43128779047006,"sku":"401488","price":275.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/401488_image_982f35e3-aa3a-4311-bc74-88c0407f664c.png?v=1786069898","url":"https:\/\/nationalboilersupply.com\/products\/hoffman-401488-model-79-water-main-vent-valve","provider":"National Boiler Supply","version":"1.0","type":"link"}