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Continue to ChatJOUCOMATIC 445500110500 - 20mm Bore, 500mm Stroke, Elastic Cushioning, STG20NA500DM, Series 445 Rodless Cylinders (Type STG) https://www.valves-direct.com/product/joucomatic-445500110500-20mm-bore-500mm-stroke-elastic-cushioning-stg20na500dm-series-445-rodless-cylinders-type-stg/