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Check Valve, 1/2 NPT Female Ports
This one-way check valve is ideal for use in oil systems. The spring-loaded ball allows flow with very little restriction in one direction, but positively stops flow in the other direction. It is most often used to prevent back flow of oil from an Accusump Oil Accumulator through the oil pump. (Cannot be used if the Accusump is connected directly to the engine block with a single hose.)