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Continue to ChatJOUCOMATIC 43400124 - 100mm Bore, Rectangular Front/Rear Flange MF1 - MF2, Mountings for Series 450 Cylinders (Type PES) https://www.valves-direct.com/product/joucomatic-43400124-100mm-bore-rectangular-front-rear-flange-mf1-mf2-mountings-for-series-450-cylinders-type-pes/