This EH series is interchangeable with CEJN 525 SERIES, STUCCHI IRCX SERIES, and TEMA T SERIES. Stainless Steel Product. The 203 Series Interchange Coupler (Nordic-type) combines advanced safety and reliable sealing for demanding hydraulic applications. Its protective safety sleeve prevents accidental disconnection, while the elastomer-sealed poppet valve ensures leak-free performance when disconnected. The series offers dual poppet options—standard and pressure-eliminator variants—to meet diverse system requirements. Designed for flexible operation, these couplers allow connection under residual pressure (male or female side), provided the counterpart is pressure-free, ensuring safe and efficient maintenance in industrial environments. 203 is the connection under pressure version. 205 is the version without any internal valve, so free flow. All in AISI 316 stainless steel.