Agility ProCab Compressed Natural Gas Fuel System, Mounts Behind Cab, 4 CNG Tanks, Each Tank 27"Dia x 80"L, 3600 psi, Nominal Capacity 39 DGE, 522L Water Volume (2088L Total), Tank Exp. Date 4/2035. Unit Measures 93.5"W x 31"D x 111"H. Tanks P/N 240244-001, S/N 3020-056.