MPT (male pipe thread) mounted on top side of pressure gauge. To determine the size of the end that fits into the tank, measure the OD of the threads, then subtract 1/4" because pipe sizes always measure 1/4" over the actual size. (for instance, if it measures around 1/2", this will be a 1/4" MPT fitting)
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15-pc Thunderbolt Black Oxide Drill Bit Set
1/4" x 50 Ft Noodle Air Hose with Coupler and Plug