I HAVE THAT IS AT LEAST 30 YEARS OLD. I HAD NOT USED IT LATELY, BUT THEN I NEED IT. IT WORKED FINE, BUT LEAKED AIR AT ADJUSTING VALVE. SO I ORDERED 2 NEW ONES. THEY DON'T LEAK, BUT DO NOT REGULATE AIR PRESSURE!!!!!!!! I JUST USE THEM TO TURN AIR ON AND OFF.