Regulator-To-Hose Quick Connect SetBrass 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. Gas Type: Fuel Gas, Oxygen/Inert Gas; Includes: QDB31, QDB32; Material: Brass; Type: Quick Connect; Weight: 0.62 lb.