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Pressure vacuum vents are installed on the top of underground and low volume aboveground storage tank vent pipes
Modular Air Valve - Stall-free
and drums as a gravity flow shut-off valve
or even hold it during filling
Designed for use in vertical piping systems
Morrison Bros 158B-0800 AV 3" Vertical Back Pressure Valve Air Grease Pumps Pressure vacuum vents are installedSingle poppet one way check valve used to maintain product flow in one direction. Heavy spring for back pressure applications. NOTE: Opening pressure settings are approximate. Standard Features Metal to metal seats 5 to 7 PSI spring settings Construction Details Body: Brass Cap: Brass Plunger: Brass Spring: Stainless steel Expansion valve: Brass with FKM
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