Kingston Model 226A Vertical Check Valve is a robust check valve offering the same basic features as the Model 226 but is slightly longer, has a 1/8″ unloader port, and is available with Teflon disc only. Kingston Vertical Check Valves are designed for use on the discharge line of lubricated or non-lubricated air compressors to prevent back flow from the air tank. Maximum operating pressure 400 psi. Temperature range -250°F to 350°F.