This EH series is interchangeable with PARKER FH SERIES, STUCCHI A-HP SERIES, CEJN 265 SERIES, FASTER FFHP SERIES, and DNP PLT7 SERIES. Steel Product. Engineered for extreme hydraulic systems, these 72 MPa-rated couplings deliver uncompromising performance in critical high-pressure applications. To ensure operational safety, this series is intentionally incompatible with standard ISO 16028 or low/medium-pressure flat-face couplings, preventing risky cross-connections. Instead, it pairs exclusively with dedicated high-pressure counterparts available on the market. An innovative rotating sleeve on the female half automatically engages post-connection, providing a fail-safe lock against accidental disengagement under pressure.