Quick Connect Set, Torch to Hose, Brass, QDB11 QDB12, Fuel Gas Oxygen no checkout Two sided tag with warning messages Two sided tag with warning messages and graphics Both sides have lines for writing additional information Write on polyester laminate protects the graphics thus eliminating leak paths and ensuring complete contact between the threads for a complete seal Prevents corrosion and galling in threads Brass construction provides long service life Non interchangeable oxygen and fuel gas connectors Instant closure on reverse flow check valves Spring loaded locking mechanism responds to fingertip action and achieves a gas tight connection Double seal socket connection on second seal