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Continue to ChatAVENTICS - R913030290 - Nut for cylinder mounting, Series MR3 (HEXAGON NUT DIN439-BM22X1,5-A2-50) https://www.valves-direct.com/product/aventics-r913030290-nut-for-cylinder-mounting-series-mr3-hexagon-nut-din439-bm22x15-a2-50/