On sale! (normally $5) The 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.