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Continue to ChatDeltrol Fluid ZCO-42 - Ball Type, Low Leak, Max PSI 3500 (241 Bar), Direct Acting, Cartridge Check Valve https://www.pneutrol.com/industrialspares/product/deltrol-fluid-zco-42-ball-type-low-leak-max-psi-3500-241-bar-direct-acting-cartridge-check-valve/