TorqueR J-Plugs have no metal parts. Made from engineering grade polymer blend, commonly used to replace steel gears. Resistant to most chemicals, unaffected by freezing or high temperatures. Simple reliable locking system that is easily disassembled in the field for decontamination. High-Tech liquid tight seemless dual rubber gaskets. Accepts either #1 or #3 padlocks. Wing nut for easy grip on and off. Has strong instrument tether on bottom. Bright color for easy well locating, and Made in the U.S.A.