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Continue to ChatJOUCOMATIC 43400009 - 50mm Bore, Rectangular Front/Rear Flange, MF1-MF2, Series 436 Heavy Duty Cylinders (Type PIS) https://www.valves-direct.com/product/joucomatic-43400009-50mm-bore-rectangular-front-rear-flange-mf1-mf2-series-436-heavy-duty-cylinders-type-pis/