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Continue to ChatJOUCOMATIC 43800091 - 40mm Bore, 100mm Stroke, Double Acting, Series 438 Isoclair Round Cylinder (Type CIS) https://www.valves-direct.com/product/joucomatic-43800091-40mm-bore-100mm-stroke-double-acting-series-438-isoclair-round-cylinder-type-cis/