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Continue to ChatJOUCOMATIC 43800187 - 40mm Bore, 25mm Stroke, Single Acting, Series 438 Isoclair Round Cylinder (Type CIS) https://www.valves-direct.com/product/joucomatic-43800187-40mm-bore-25mm-stroke-single-acting-series-438-isoclair-round-cylinder-type-cis/