For sale is a STEEL TANK 350 GALLON. Total size: 121 x 55 x 55 Output: 6" and 7" with 1/2" bolts. This tank has no ASME label and is not for compressed air. It has pressure gauges on it (damaged during handling) that go up to 30 PSI, so I would think that filling it with water up to 30 PSI would be fine. Buyer is responsible for determining a safe application for this tank, or else injury and death will occur.