Features zinc-plated solid brass bodies and sleeves with stainless steel springs, hardened steel locking balls and valves and Buna-n (nitrile) seals. Precision machined bar stock construction provides resistance to the effects of mechanical shock in rugged applications. 1/4 in female national pipe thread 1/4 in coupler. Interchangeable with most Automotive Standard series couplers and plugs produced by other manufacturers.