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From the manufacturer:
From the manufacturer:
The Spirax Sarco AE50S, 3/4" NPT, 435psig, Stainless Steel, Water & Liquid, Air Eliminator are designed for use on liquid installations. The body and cap are made from a special brass alloy, which is dezincification resistant (DZR). The fitted lockshield valve has a unique 3 way locking system enabling the valve to be either locked open, locked closed or be used as conventional ball valve. The air vent should be installed vertically with the inlet at the bottom. Sarco recommends piping discharge from the air eliminator/air vent to a suitable drainpoint.