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Continue to ChatAVENTICS - 8103040344 - Nut for piston rod, Series MR9 (HEXAGON NUT DIN934-M20X1,5-8-A2A) https://www.valves-direct.com/product/aventics-8103040344-nut-for-piston-rod-series-mr9-hexagon-nut-din934-m20x15-8-a2a/