Interchangable with most Tru-Flate, Industrial and ARO series plugs produced by other manufacturers. Features solid brass bodies with zinc plating and sleeves with stainless steel springs, hardened steel locking balls and valves and Buna-n (nitrile) seals. Plugs are plated steel with hardened wear points. Precision machined bar stock construction provides resistance to the effects of mechanical shock in rugged applications.