This 1/4″ MNPT M-Style coupler features a case hardened steel drag guard to prevent accidental uncoupling. M-Style couplers offer a 1/4″ basic flow size and a maximum inlet pressure of 300 PSI. Complete with a Buna-N seal, M-Style KWIK-CHANGE couplers and plugs will interchange with all manufacturers who comply with the dimensional requirements of military specification MIL-C-4109.