Firestone Air Tank / Reservoir Tank Capacity:3 Gallon;Tank Diameter:7 Inches;Tank Length:20.75 Inches;Tank Material:Corrosion Resistant Steel;Max Air Pressure:150 psi;Fittings, (Qty) & Size:(2) 3/8 NPT bungs. Firestone Ride-Rite Firestone Ride-Rite Air Tank / Reservoir - 9229 9229 Air Tank