CANTON Coolant Header Tanks are availble in 2 sizes. 1L Size: 5-1/2IN Tall, 4-1/2IN Wide, 3IN Deep. Side Port: 3/8NPT. Bottom Port: 1/2NPT. 2L Size: 8IN Tall, 5IN Wide, 4IN Deep. Side Port: 3/8NPT. Bottom Port: 1/2NPT. These Header tanks are built with .100inch thick aluminum and has a billet aluminum neck with a barbed overflow fitting and accepts standard radiator caps.