GENTEC Check Valves prevent reverse flow of gases which can cause dangerous mixtures. Choose from four styles to fit your needs: 24- CV5 series check valves are attached to the torch ends with Bin size fittings; 24-CV7 series check valves are attached to the torch ends with Bin size fittings; 24-CV8 series check valves replace the standard Bin size outlet bushings on regulators; 24-CV9 series check valves attach to the Bin size outlet bushings on the regulators