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The check valve permits free flow in one direction and no (checked) flow in the opposite direction. This valve is specified in many applications because of its very low cracking pressure (typically less than 0.5 psig), its excellent repeatability, and leak-tight operation. The unique design of the housing permits the valve to handle a back pressure of up to 250 psig. Custom variations of barbed and threaded bodies are available as well as variations with built-in screen filters or sintered metal filters. Contact the factory for details.