3 Pack of Prevost USI061203 Truflate automotive style 1/2″ Female NPT air coupler with a 1/4″ body. These are very high quality Prevost couplers that feature a non-marring, impact-resistant, high-grade composite body. These couplers are easy to use for anyone and is built for safety and high efficiency! The quick release button on this coupler allows you to easily release plugs with one hand! It also purges the air on everything downline, such as air hose and tools, so that there is no hose whipping or sudden pressure releases.