Enamel Coated Two-Port Check Valves have two different openings, one for fluid to enter and the other for fluid to leave. These Two-Port Check Valves are made using different materials that include carbon steel, stainless steel or ductile iron to ensure long lasting usage. These Two-Port Check Valves are available with stainless steel spring to facilitate ease of operation. Enamel Coated Two-Port Check Valves are offered in a size range varying from 1.5 inch to 48 inch.