Designed to protect hot water supply systems and pressure vessels against negative pressure. It is especially well suited for many domestic and commercial systems. Works by preventing internal vacuum conditions that could result in burned out heaters and/or collapsed storage tanks - especially copper. Installed on the cold water supply line, it closes tightly under pressure and opens at a 1 inch mercury vacuum. Atmosphere admitted to the system breaks the vacuum, preventing collapse of the storage tank. Recommended that it be installed in an upright position. Male inlets. Features a low profile design with a slotted vent hole. The vent hole is protected by a circular dust cover that is approx. 1.75 inches in diameter. This valve features an all breaa body and body cap, a heat-resistant silicone seat disc, an integral body seat and brass internal working parts. Lead free. CSA certified per ANSI Z21.22/CSA 4.4. 200 psi.
Specifications - Max Inlet Pressure: 200 PSI
- Connection Type: Threaded
- Size: 0.75 in.
- Material: Brass
- Weight: 1.5 lbs
- SKU: ZX9WLLCH18664
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