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Continue to ChatJOUCOMATIC 97801412 - 25mm Bore, Trinorm, Piston Seal + Cushioned, Spare Part Kit for Series 436/437 Cylinders https://www.valves-direct.com/product/joucomatic-97801412-25mm-bore-trinorm-piston-seal-cushioned-spare-part-kit-for-series-436-437-cylinders/