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Apollo Model VR Vacuum Relief Valves is designed to automatically vent a system should a vacuum occur. It prevents siphoning of water from the system and/or tank collapse.New Bras Poppet for Improved StrengthSizes 1/2'''' and 3/4''''Suitable for LP Steam (15 psig max)Auto Vacuum Relief at less than 1/2'''' Vacuum
Brass Vacuum Relief Valve with Satin Brass Finish 1/2' (MNPT)