This EH series is interchangeable with PARKER 4000 SERIES, DIXON AG SERIES, EATON AEROQUIP FD42 SERIES, FASTER NV SERIES, DNP PDV1 SERIES, STUCCHI IRV SERIES, SAFEWAY S20 SERIES, and VOSWINKEL ID SERIES. Steel Product. ISO-5675 compliant. The 66 series features poppet valve quick couplings that are interchangeable with the 68 ball valve series. Manufactured from zinc-plated carbon steel, these couplings offer superior sealing performance compared to ball valve designs. ISO-7241-A compliant (1/2'' Body Size Only). The rest body sizes are interchangeable with PARKER 4000 series and Faster NV series. Note that the FASTER NV SERIES 3/4'' size is different from the PARKER 4000 Series 3/4'' size.