Adapter fittings are manufactured to be threaded directly into standardized NPT 1/2" mates. The Valved Flow path maintains a controlled disconnect of fluid and gas lines that are under pressure. Polysulfone is a rigid, high-strength, semi-tough, transparent plastic that offers higher heat resistance and better hydrolytic stability than polycarbonate. Viton O-Rings have excellent resistance to synthetic hydraulic fluids, fuels, aromatics, and many organic solvents and chemicals. 302 Stainless Steel is a material that is corrosion resistant and is considered a general-purpose spring. Size 12 fittings are designed to accommodate tubing that measures 3/4” or 19.05mm (ID).