Marshall Excelsior 5/16-32 MNPT/ 1/8" MNPT/ 1/2" MNPT x 1/8" MNPT Brass LP Adapter Fitting METL051 06-0294

It measures 5/16-32 MNPT/ 1/8 inch MNPT/ 1/2 inch MNPT x standard test hose fitting/ 1/8 inch MNPT. It has three threads on one end with a hose barb and an 1/8" MNPT on the other end. A hose can easily be attached to either end and can be connected to a manometer or other flow meters to check line pressure on an appliance.