S30 Series hydraulic quick-connect couplings are designed for extreme high-pressure applications including portable hydraulic rams, wire pullers, and frame straightening equipment. These special-purpose couplings feature poppet-style valving with a double shutoff to eliminate low-pressure leakage. Threaded sleeve locking mechanism mates coupling halves. Couplings are fully interchangeable, half-for-half, with ball valve designs.