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 blue anodized with clear anodized caps. Size: 2-3/4" Dia., 9" total height Tank: 24 oz. tank Top Vent Port: 3/8" N.P.T. Bottom Port: 3/8" N.P.T. with petcock.