Air Lift 4 Gal Alum Tank - (4) 1/4in Face (2) 3/8in Ports & 1/4in Drain - 30in L X 6in D - Polished2. 5 Gallon Aluminum Air Tank, (4) 1 4in face ports, 6in D X 20in L, light weight, raw aluminum, 200PSI maximum operating pressure. Customizing your car is all about choices and when it comes to your air tank, that should be no different. With our aluminum tanks, we can offer you a wide variety of sizes, port configurations, and finishes. Our extruded aluminum tanks are now available in raw aluminum or in a super high quality polished finish. If the