Description Small Air Pressure Tank 6-1/2L x 1-3/4 Diameter Overview This is a compact air tank for use with all pneumatic retracts. Air Capacity: 14.5 cu. in. (237.6 cu. mm.) Constructed of aluminum, with a sealed steel cap, this tank is safe for pressures to 150 psi. Approximate Size: 6 1/2″ L X 1 3/4″ Dia.