342 series couplings withstand extremely rough handling in extra tough applications. This series features a zinc-plated steel/brass construction with a locking sleeve made of hardened zinc-plated steel. Offering a wide range of connections, as well as anti-hose whip nipples. The automatic safety-locking feature prevents unintentional disconnection. See 341 series for diving applications, or 344 series for firefighting or diving applications.