The 1/2" ISO-A Female O-Ring Boss Coupler, Steel is a high-performance hydraulic fitting designed for secure, leak-free connections in fluid transfer systems. Featuring a ISO-A Female O-Ring Boss (ORB) connection, this coupler ensures a tight metal-to-rubber seal, preventing fluid leakage and contamination in high-pressure applications. These fittings use poppet valves to prevent uncoupled leakage, with induction-hardened critical parts, a dependable ball-locking mechanism, and precision-machined solid barstock components, all sealed with nitrile rated for -40°F to +250°F.