Billet aluminum overflow catch tank, or recirculating expansion tank. Features screw in end caps with o-ring seals, two 90 deg. and one straight 5/16" barbed fitting, petcock drain plug, and mounting clamp. The tank is has a raw aluminum finish. Size: 2-3/4" Dia., 6" high cylinder, 9" total height with fittings. Tank: 15 oz. Tank Top Vent Port: 3/8" N.P.T. Bottom Port: 3/8" N.P.T. with petcock.