This is the fitting you need for 1/2" hose ends with 1/4" NPT fittings to connect to M-Type quick couplers. The M-Type connector is common to most small compressors running nail guns, sanders, ratchets, paint guns and etc. Mount it with teflon thread tape to assure leak free operation. Milton makes a wide variety of quality fittings for air service. This is a durable fitting, made in the USA.