Quick Connect Set, Regulator to Hose, Brass, QDB31 QDB32, Fuel Gas Oxygen no checkout and dirty surfaces Enamel paint for and dirty surfaces Enamel paint for extreme durability and enhanced wear Heavy duty steel body with double slide support for rigidity Durable spring loaded mechanism holds terminal lug in place Easy to read scale on both sides of drive punch Wide base for stability 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