Coolant Expansion Tank is 1-1/4 Quart. Dimensions: 5-1/2" Tall, 4-1/2" Wide, 3" Deep. Side Port: 3/8" N.P.T. Bottom Port: 1/2" N.P.T. Expansion tank is built with .100" thick aluminum and has a billet aluminum neck with a barbed overflow fitting. Accepts standard radiator caps.