Prevost Silver Air Plug Couplers IRC061251 1/4" MNPT - 4 Pack Four brand new Prevost IRC61251 1/4" body air couplers. These are very high quality Prevost couplers that feature non-marring, impact resistant, high grade composite bodies. These couplers are easy to use for anyone and are built for safety and high efficiency! The quick release button on these couplers allow you to easily release plugs with one hand! They feature 1/4" female NPT threaded inlets and are compatible with Prevost Industrial Interchange Style air plugs. Specifications Per Coupler 1/4" Male NPT Easy To Use Anti-marring Heavy Duty Composite Body Steel Inner Construction This listing is for four (4) Air Plug Couplers.