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Continue to ChatJOUCOMATIC 43600419 - 40mm Bore, 320mm Stroke, PIS40A320DM, Series 436 Heavy Duty Cylinders (Type PIS) https://www.valves-direct.com/product/joucomatic-43600419-40mm-bore-320mm-stroke-pis40a320dm-series-436-heavy-duty-cylinders-type-pis/