These SÜA kits of repair parts are designed for 1/4" I.D. twin welding hoses with 9/16"-18 Type “B” ConnectorsMachined in high quality brass rated for 200 psi. Comply with CGA standards for Oxygen and Acetylene/Propane gases.Choose from the different repair kit options; Couplers, Connectors, Barbed Splicers, Connectors + Couplers, Connectors + Splicers, Connectors + Couplers + Splicers.Select your option and carefully check all the pictures with the dimensions and compare with your welding hose to make sure it is 1/4” I.D. with 9/16"-18 Type “B” Connectors. These kits won't work with smaller or larger hoses and connectors.These kits allow you to connect and repair your worn, leaking, or damaged twin welding hoses, A ferrule crimper will be needed for those kits that include ferrules.