PRH HIGH-PRESSURE (42 MPa; 6,000 psi) flat-face screw couplings are designed for minimum fluid loss and air ingestion when connecting and disconnecting hydraulic lines. They come in diameters from 3/8 to 1¼ in. with zinc nickel coating for corrosion resistance and resist pressure pulsations. Color-coded rings make for easy identification of the hydraulic lines. Applications include earth-moving equipment and self-propelled steered heavy load transport modules.