Quick Connect Set, Torch to Hose, Brass, QDB11 QDB12, Fuel Gas Oxygen ORS NASCO protecting knees against hard surfaces Lightweight protecting knees against hard surfaces Lightweight and has a built in handle making it easy to carry and transport and convenient to hang and store Water resistant and petroleum resistant construction make it perfect for everything from bath time to work in the garage Designed for kneeling on cold surfaces On Off Magswitch magnet control ensures precise placement Turns all the way off and stays clean Machined at 90 degrees Magnetic grip on five sides and strong on three sides Pipe notch 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