Six piece M-Style® swivel coupler and plug kit includes various couplers, plugs and fittings. M-Style® couplers have a 1/4" basic flow size and air flow of 40 SCFM. These KWIK-CHANGE® couplers and plugs will interchange with all manufacturers who comply with the dimensional requirements of military specification MIL-C-4109. M-Style® couplers are made with case hardened steel and have a maximum pressure of 300 PSI.