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Continue to ChatJOUCOMATIC 445500040500 - 20mm Bore, 500mm Stroke, STN20NA500DM, Series 445 Rodless Cylinders Non Guided Carrier (Type STN) https://www.valves-direct.com/product/joucomatic-445500040500-20mm-bore-500mm-stroke-stn20na500dm-series-445-rodless-cylinders-non-guided-carrier-type-stn/