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The Apollo 61-700 check valve is ideally suited for cold water, and air applications for prevention of reverse flow. The modular check cartridge provides superior leak-tight performance with low pressure loss. It is rated at 230 PSIG with a maximum temperature of 200 degreeF.Sizes: 1/4'''' - 1''''Acetyl Check Valve BodyNitrile (Buna-N) Check SealsASTM B16 Brass HousingCheck Opening Pressure: .5 psi