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Butterfly valves are commonly used in systems that need to isolate or regulate the flow of air, gas, steam, liquid or other materials. They are designed to be in systems where there are space, weight and cost considerations. General service butterfly valve 313103 has a wafer body with ductile iron body material. The pressure rating is 200 lb. This valve meets MSS-SP-67 specification. Butterfly valves utilize lever operation for 2" - 8" and gear operation for 10" and up.