Apollo
Water Heater Vacuum Relief, 1/2' & 3/4' The Apollo® Model VR Vacuum Relief valve is designed to automatically vent a system should a vacuum occur. It prevents siphoning of water from the system and/or tank collapse. Water Hot Water Liquids: 10-100 300 Series: 10-320 Series: Safety Relief Valves, ASME HV Sec IV, 3/4'x1'
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