DKJ card sets of metal hose connectors, can no threaded pipe and hose connections, save the threading process, just to drive the screw into the can. Metal joints made of zinc alloy die-casting, zinc plated, brushed or chrome; compact, high strength. Steel and metal hose connection is reliable, beautiful appearance. The metric pipe fittings of card sets for the metal hose is connected to the top of the steel pipe with no threads. Adapter metal hose: JS type, JSH type, JSB type, JSHG type. Adaptation steel: thin steel wire tube, black, galvanized iron pipe (water, gas pipes).