{"product_id":"hoffman-401475-model-508-water-vent-valve","title":"Hoffman 401475 Model 508 Water Vent Valve","description":"\u003cp\u003eMaintaining optimal hydronic system efficiency requires reliable air removal, and the \u003cstrong\u003eHoffman 401475 Model 508\u003c\/strong\u003e water vent valve is engineered to provide exactly that. This automatic air vent prevents air binding and associated noise by continuously purging air from radiators, convectors, and piping circuits to ensure consistent heat distribution throughout your building.\u003c\/p\u003e\u003cp\u003eThe valve operates using an internal float-activated mechanism that remains closed while water fills the chamber; as air collects, the float drops, opening the precision-engineered needle valve to allow trapped gases to escape. Once the air is purged and water re-enters the valve, the float rises to reseat the needle, creating a watertight seal for worry-free operation.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Air Purging:\u003c\/strong\u003e Eliminates system airlocks that cause cold spots in radiators.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRugged Construction:\u003c\/strong\u003e Built for high-pressure durability in residential and commercial hydronic loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNoise Reduction:\u003c\/strong\u003e Minimizes gurgling sounds caused by air trapped in hydronic circulators and piping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Standard threading allows for rapid replacement in existing systems.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for hot water heating systems, high-point pipe venting, baseboard radiation, and commercial fan coil units where persistent air accumulation hinders thermal output.\u003c\/p\u003e","brand":"Hoffman","offers":[{"title":"Default Title","offer_id":43128765546590,"sku":"401475","price":22.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/401475_image_a3e7a07f-fca1-4bbf-9ba0-7271cfbe2ded.png?v=1786069685","url":"https:\/\/nationalboilersupply.com\/products\/hoffman-401475-model-508-water-vent-valve","provider":"National Boiler Supply","version":"1.0","type":"link"}