This EH series is interchangeable with PARKER 6600 SERIES, HANSEN HA15000 SERIES, VOSWINKEL IA-VA SERIES, FASTER NV STAINLESS STEEL SERIES, and DNP PAVX SERIES. Stainless Steel Product. The 73 series is a poppet-type quick coupler compatible with ISO 7241-1 “A” standards. Constructed from stainless steel, it ensures global interchangeability and is available in sizes from ¼” to 2”. Due to its versatility, the 73 series is widely used in hydraulic systems, particularly in agricultural and industrial applications.