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4 Inch Stainless Steel Chemical Road Tanker Emergency Shutoff Valve. Customizable Vapor Interface: Vapor inlet/outlet interface size can be customized according to customer requirements. Insulation Heating Function: Insulation layer allows direct heating through vapor inlet/outlet for crystalline substances. High Corrosion Resistance: Whole valve body made of stainless steel (304/316) for superior corrosion resistance. Superior Sealing Safety: PTFE sealing gaskets ensure reliable sealing and protect tanker from leakage. Easy Replacement Design: External dimensions match non-insulated valves for easy user replacement. Dual Open Method: Supports both Manual and Pneumatic open methods for flexible operation.