This EH series is interchangeable with Parker 20 series, Parker 30 series, Hansen 1000 series, Hansen 3000 series, Rectus 23KA series, Rectus 24 series, Rectus 1400 series, Rectus 1423 series, CEJN 310 series, TEMA 1400 series, FOSTER 3/4/5/6 SERIES, GROMELLE 600 series, JWL 521 series, JWL 531 series, and Eaton 43 series pneumatic quick couplers. Brass / Steel Product. This sleeve-type coupler accepts industrial interchange. It is widely used to connect air lines and low-pressure fluids. Its compact and economical design uses a ball locking mechanism consisting of captive steel balls that engage the locking groove on the mating nipple. The sliding spring-loaded sleeve on the coupler must be manually retracted to connect or disconnect the nipple. Common applications include compressed air, water, grease, paint, limited vacuum, and limited gases.