"G" Style 1/2" NPT Male Coupler MIL-S1816 Milton 1816

Brand New Milton 1816 1/2" MNPT G-Style Coupler, pack of one.
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From the Manufacturer:

1/2" national pipe thread

Maximum inlet pressure of 300 pounds per square inch

Air flow of 99 standard cubic feet per minute

Maximum temperature of 250 degrees Fahrenheit

Buna-N seal

1/2" NPT G style couplers are used in applications that require over 60 SCFM. There are two Milton® G Style couplers, but both will function the same with G style plugs. Milton® G style couplers are made of steel and are plated to resist rust. With a 1/2" basic airflow, these plugs offer up to 99 SCFM, making them the highest SCFM rated couplers. Maximum pressure of 300 PSI.