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Continue to ChatJOUCOMATIC 43900203 - 32mm Bore, Neck Nut MR3, Series 438 Isoclair Round Cylinder (Type CIS) https://www.valves-direct.com/product/joucomatic-43900203-32mm-bore-neck-nut-mr3-series-438-isoclair-round-cylinder-type-cis/