Firestone Air Tank / Reservoir Tank Capacity:1/4 Gallon;Tank Diameter:4 Inches;Tank Length:6 Inches;Tank Material:Corrosion Resistant Steel;Max Air Pressure:150 psi;Fittings, (Qty) & Size:(2) 1/4 NPT bungs. Firestone Ride-Rite Firestone Ride-Rite Air Tank / Reservoir - 9166 9166 Air Tank