Torch-to-hose set with check valves. Includes QDB11 (fuel gas) and QDB12 (oxygen/inert gas) components. Provide fast, reliable and positive connections and quick disconnections for torches, hoses and regulators. All models are color-coded for gas service for added safety (oxygen/green, fuel gas/red, inert gas/blue). Oxy/fuel gas models include integral reverse flow check valves. Quick connects fit all B-size welding and cutting equipment. Brass construction provides long service life cycle tested over 10000 operations indicating service life of 10 to 12 years of comparable use. Non-interchangeable oxygen and fuel gas connectors prevent accidental gas mixing. Instant closure on reverse flow check valves with total shutoff at only 10 oz of back pressure. 1100 SCFH flow at 125 PSIG inlet pressure and 800 SCFH flow at 125 PSIG inlet pressure when 2 additional check valves are used in conjunction with the quick connects. Spring loaded locking mechanism responds to fingertip action and achieves gas-tight connection. For inert gas models, demand valve on supply side creates a positive seal when fitting is not connected. Double seal socket connection on second seal provides added safety protection. Installation and operating instructions included.