Being a registered professional engineer I can't recommend it, but at 3 psi you will be OK if you absolutely limit the pressure to 3 psi. One easy way to do that is to put a large nozzle on top with a weight on it. You don't mind if the nozzle leaks a little air. For instance, a 2" sch 40 pipe has an internal area of 3.36 sq inches. At 3 psi that takes 10 lbs to hold the pressure. If you put a 4-1/2" round steel plate on the top that is 2" thick (or four 1/2" plates) that is about 9 lbs. With a normal air hose you would never overpressure a tank with a relief valve like that. too much leakage and the plate will vibrate off and leave a full 2" vent.
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Today's Featured Article - Repairing A Massey Harris 22 - by John Reeves. I have just given this old girl (boy?) a replacement RH rear axle. I was lucky enough to find an axle in good shape at a reasonable price - also a replacement for the right rear brake assembly which was
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