Prevost ASI 061203 coupler. This is a very high quality Prevost coupler that features a non-marring, impact resistant, high grade composite body. This coupler is 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 down line, such as air hose and tools, so that there is no hose whipping or sudden pressure releases. This coupler features a 1/2" Female NPT threaded outlet, with a 1/4" ARO body inlet.