This six piece HIGHFLOWPRO ® V-Style coupler and plug kit includes various coupler and plugs with a 1/4" basic flow size. Milton ® V style plugs will accept M-Style ® and A style plugs, however, to retain maximum flow, only use V style couplers and plugs together. These V style couplers are made of brass, while the plugs are made of steel. Kit includes two 1/4" MNPT plugs, two 1/4" FNPT plugs and two 1/4" FNPT couplers. V style couplers and plugs offer a maximum pressure of 300 PSI and air flow of 74 SCFM.