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i converted a 20 lb LP tank to an air tank. i removed the tank valve and purged and washed with soap and water two or three times then left it to dry. i used pipe fittings and a psi relief valve rated at 125 psi with a small psi gauge and the open close valve with a quick coupler. this is all flush with the top of the tank protection handles on the tank. the 20 lb tank at 120 psi will fill one 15" tire from flat to 35 lbs. the time and money i spent 8 years ago on it was worth it. today the portable air tanks are cheaper to buy than retro fit a lp tank. these tanks are rated for 375 lbs or what the stamp on the top of the tank says.