The FD90 Series diagnostic coupling is designed to connect and disconnect pressure gauges to hydraulic systems, eliminating the need for permanent gauges. The maximum operating pressure is 7,000 psi. Automatic sleeve for one hand push-to-connect operation. Flush face valving provides minimal fluid loss and low air inclusion. Self-sealing valve design allows connection and disconnection at 500 psi. Broad range of end configurations for system accessibility. Standard seal material – Buna-N. Standard seal material – High resistance carbon steel with zinc trivalent plating.