{"product_id":"watts-0590723-air-vent-valve","title":"Watts 0590723 Air Vent Valve","description":"\u003cp\u003eThe \u003cstrong\u003eWatts 0590723\u003c\/strong\u003e (also known as the \u003cstrong\u003eFV-4M1 3\/4\u003c\/strong\u003e) is a high-performance \u003cstrong\u003eautomatic air vent valve\u003c\/strong\u003e engineered for demanding commercial and residential hydronic heating systems. Designed to purge trapped air from hot or cold water distribution lines, this \u003cstrong\u003e3\/4 inch NPT air vent\u003c\/strong\u003e features a rugged brass body and cover capable of handling system pressures up to \u003cstrong\u003e150 psi\u003c\/strong\u003e and operating temperatures reaching \u003cstrong\u003e240°F\u003c\/strong\u003e. Its high-temperature resistant polyethylene float and silicone rubber seal ensure a reliable shut-off when air is displaced, preventing fluid loss even in systems utilizing glycol. Whether used as a primary venting solution or an \u003cstrong\u003eanti-vacuum device\u003c\/strong\u003e during system drainage, the \u003cstrong\u003eWatts FV-4M1 auto vent\u003c\/strong\u003e maintains efficiency by allowing continuous air separation while fluid circulates. The vertical orientation and accessible brass cap allow for easy field maintenance, as the unit can be fully disassembled for inspection and cleaning to prevent debris-related failures in \u003cstrong\u003ehydronic heating applications\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits:\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Brass Construction:\u003c\/strong\u003e Heavy-duty brass body and cover provide long-term resilience in high-pressure 150# environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGlycol System Compatibility:\u003c\/strong\u003e Equipped with a high-temperature polyethylene float designed specifically for \u003cstrong\u003ehydronic water systems\u003c\/strong\u003e and glycol-based loops.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAnti-Vacuum Functionality:\u003c\/strong\u003e Effectively serves as a vacuum breaker to permit air intake when the system needs to be drained.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdvanced Sealing Technology:\u003c\/strong\u003e Features a silicone rubber seal that remains unaffected by standard system impurities, ensuring a leak-proof closure.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eServiceable Design:\u003c\/strong\u003e Can be easily disassembled on-site for routine cleaning and inspection of internal components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Questions:\u003c\/strong\u003e\n\u003cp\u003e\u003cstrong\u003eCan the Watts 0590723 be installed horizontally?\u003c\/strong\u003e\u003cbr\u003e\nNo, this \u003cstrong\u003eautomatic air vent\u003c\/strong\u003e must be mounted in a strictly vertical position to ensure the internal float operates correctly to actuate the valve plug.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is my air vent leaking water from the top cap?\u003c\/strong\u003e\u003cbr\u003e\nLeaking usually occurs if debris is trapped in the valve seat or if the small vent cap is tightened too far. Ensure the cap is backed off two turns for proper venting and inspect the internal silicone seal for cleanliness.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this vent suitable for steam applications?\u003c\/strong\u003e\u003cbr\u003e\nThe \u003cstrong\u003eWatts FV-4M1\u003c\/strong\u003e is rated for hot water and hydronic systems up to 240°F. For high-pressure steam, verify that the system requirements do not exceed the 150 psi standard operating limit for this specific model.\u003c\/p\u003e\n\n\u003cp\u003eDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.\u003c\/p\u003e","brand":"Watts","offers":[{"title":"Default Title","offer_id":43081481224370,"sku":"0590723","price":58.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Pic_aa552b63-0d48-4026-8b5d-b03eea465d79.png?v=1779331582","url":"https:\/\/www.gsistore.com\/products\/watts-0590723-air-vent-valve","provider":"GSIstore","version":"1.0","type":"link"}