Used on vsirius class t-afs 8, smory s. land class as, forrestal class cv, victorious class t-agos 19, impeccable class t-agos 23, usns stalwart class tagos, mars class t-afs 1, arleigh burke class ddg. fire pumps. cargo/weapon elevators.. weapon system essential. major components: black push botton 1, full guard 1, mtg bushing 1, contact block mtg screws 4.