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Continue to ChatJOUCOMATIC 97801418 - 50mm Bore, Trinorm, Piston Seal + Cushioned, High Temperature, Spare Part Kit for Series 436/437 Cylinders https://www.valves-direct.com/product/joucomatic-97801418-50mm-bore-trinorm-piston-seal-cushioned-high-temperature-spare-part-kit-for-series-436-437-cylinders/