This EH series is interchangeable with PARKER PD SERIES, DIXON PD SERIES, DNP PLD3 SERIES, FASTER DF SERIES, EATON AEROQUIP FD90 SERIES, BRAZIL DYNAMIC DIAGOSTICO SERIES, and HOLMBURY DTP SERIES. Steel Product. Hydraulic pressure measurement couplings featuring ISO 15171-1 compliant flat-face connections. The male component installs directly on hydraulic lines while the female interface connects to gauge instrumentation, enabling precise system pressure monitoring without fluid loss during connection/disconnection.