Prevost ISI061203 1/4" body air coupler with 1/2" female npt inlet threads (2-Pack) Prevost ISI061203 1/4" body air coupler with 1/2" female npt inlet threads. 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 hoses and tools, so that there is no hose whipping or sudden pressure releases. This coupler features a 1/4" body and has a 1/2" female NPT threaded inlet. This coupler is compatible with Prevost Industrial Interchange Style air plugs. Specifications: 1/2" Female NPT Accepts 1/4" Plugs Easy To Use Anti-marring Heavy Duty Composite Body Steel Inner Construction NOTE: 1/2" Female NPT measures approximately 3/4" in diameter when using a ruler or tape measure.