1/2" FNPT Milton G style couplers are used in applications that require over 60 SCFM. G style couplers are made of steel and plated to resist rust. There are two Milton G style couplers, but both will function the same with G style plugs. These are the highest SCFM rated couplers.
Item# : SPM9799269232
Model # : s-1815-2