X 3/16 Inch with (A) Size Fitting Connections. Flexible Grade R twin welding hose is color coded; Green for Oxygen with right hand thread fittings and Red for Acetylene Fuel gas with left hand thread fittings to prevent improper hose connection for your safety. Eight-sided crimp ferrules capable of withstanding a maximum W.P.
of 200 psi for reliability and long work life.