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Continue to ChatNUMATICS G438B4SK0320A00 - 40mm Bore, 320mm Stroke, G1/4, Double Acting, Series G438 Round Cylinders ISO 6431 https://www.valves-direct.com/product/numatics-g438b4sk0320a00-40mm-bore-320mm-stroke-g1-4-double-acting-series-g438-round-cylinders-iso-6431/