Dacron overbraid is thermo threaded to give additional protection and extra insulation. 3/16" inside diameter heavy duty PTFE tube which allows irons to operate at maximum performance. Stainless steel inside over the entire length of the hose. Prevents kinking. Also serves as a grounding device. Kink proof swivel fittings with spring guards to allow freedom of motion. Attached is third spring for suspending from iron lifter or iron whip. Accepts 1/2-24 male fitting.