EK-HFB Fitting (High Flow Barb) is a soft-tube barb fitting, designed for use with flexible soft tubing such as PVC, EPDM, Norprene, silicone or any other type of compatible flexible tube.The barb is made from nickel-plated CNC machined brass with quality O-rings while the ring is made from CNC machined aluminium. These fittings are fully compatible with EK-AF series (45°/90°) angled adapters.Technical data: thread: G1/4″ BSP; 4.5mm male thread lenght supported tube: 12mm (ID; roughly equalls 7/16″ ID) outer diameter of the tube: unlimited outer diameter of a fitting: 19.8mm installed height: 19mm compatible tubing: PVC, EPDM, Norprene, silicone, most types of flexible tube