This EH series is interchangeable with RECTUS 26KA SERIES, RECTUS 25KA SERIES, TEMA 1600 SERIES, CEJN 320 SERIES, and DIXON CJ SERIES. Brass 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.