G-STYLE: s 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. QUALITY: Durable steel-plated couplers. Case-hardened steel plugs. Both plated to resist rust and corrosion. (S-1816) 1/2" NPT Male G-Style Coupler ¤?s G-Style couplers and plugs are the highest SCFM rated and are used in applications that require over 60 SCFM. These 1/2" MNPT G-style couplers are offered in 2 different sizes (.125 or .375 critical profile dimension tip sizes), but both will function the same with G-style plugs. 1/2¤ MNPT and basic flow size, with a maximum air flow of 99 standard cubic feet per minute and 300 PSI max inlet pressure. Made of durable steel, plated to resist rust. You can also find this S-1816 air coupler included in this coupler/plug and accessory kit: #S-224 (G-Style Coupler and Plug Kit)