The Watts 0590716 (Series FV-4M1) is a heavy-duty 1/4 inch automatic air vent designed for high-performance hydronic heating systems. As the direct replacement for the discontinued 590715, this valve is engineered to purge entrapped air from hot or cold water distribution systems automatically. Built with a rugged brass body and cover, it features a high-temperature resistant polyethylene float and a durable silicone rubber seal, making it fully compatible with glycol systems. This vent is rated for a maximum pressure of 150 psi and can handle fluid temperatures up to 240°F. Its versatile design allows it to function as an anti-vacuum device and permits the separation of air while fluid is actively circulating, provided it is installed in a vertical orientation. For serviceability in the field, the unit can be fully disassembled for inspection and cleaning to maintain optimal system efficiency. Key Benefits Enhanced Durability: Solid brass construction and high-temp polyethylene float ensure reliability in demanding commercial environments. Glycol Compatibility: Specifically designed to handle chemical additives without degrading the internal seals. Field Serviceable: Easily disassembles for routine maintenance or cleaning of the valve plug assembly. Dual Functionality: Operates as both an automatic purger and an anti-vacuum breaker for system drainage. High Temperature Rating: Certified for operation up to 240°F, ideal for high-head hydronic loops. Common Questions Is the Watts 0590716 compatible with my older 590715 installation? Yes, the 0590716 is the manufacturer-designated direct replacement for the 590715 model, maintaining the same 1/4" NPT connection and technical specifications. Which way should the vent cap be positioned during operation? For the automatic venting feature to function, the small vent cap must be backed off approximately two turns. Tightening the cap fully will seal the vent manually. Can I install this air vent horizontally? No. The FV-4M1 relies on a vertical float mechanism to actuate the valve plug. It must be mounted in a strictly vertical position to ensure air is purged and water is retained. Disclaimer: 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.
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