This is the largest tank we offer with 20 gallons of volume. There are four 1/2" ports on the face, one 1/2" port on each side and there is one 1/4" port on the bottom. 44"L X 12"D Mounting feet spacing is 30.75" Center to center. The tank meets and exceeds SAE J10 specifications. The tank is epoxy enameled inside and out to prevent rust.