Detailed Product Description The Twin Seal Plug Valve has been successfully used in variety of services becauseof its high performance and Design. They are approved by foreign and China usersin Chemical Industries, Oil Refiners, Petroleum Industries, & others. 1) Materials:Body: Cast carbon steel ASTM A216-WCB, with enhanced CE of 42% max., and C of 25%max. Chrome Plated Bonnet/Lower plate: Cast ...