This EH series is interchangeable with STUCCHI APM SERIES, PARKER FEC SERIES, FASTER 3FFH SERIES, FASTER 3FFI SERIES, DIXON HTE SERIES, CEJN X64 SERIES, DNP PLK4 SERIES, SAFEWAY FFEC49 SERIES, and VOSWINKEL FU SERIES. Steel Product. These ISO 16028-compliant flat face couplings are engineered for demanding hydraulic applications, featuring a robust 35 MPa (5076 psi) working pressure rating and durable zinc-nickel plating for superior corrosion resistance. The innovative design allows safe connection under residual pressure conditions with multiple configuration options.