G-STYLE: G couplers and plugs have the highest SCFM rating. 2 styles available, both have same function.BASIC FLOW SIZE: 1/2" body size air fitting. 1/2" NPT. Buna-N seals. (G-Style offered in .125 or .375 critical profile dimension tip sizes.)USE: These couplers are intended for air shop use only. Pneumatic applications that require over 60+ SCFM.MAXIMUM: 99 SCFM air flow. 300 PSI max inlet pressure. Temperatures up to 250 degrees F.