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Continue to ChatASCO E290A471 - 2/2 NO, G1/2, Operator Diameter 50mm, Entry Under Disc, Series E290 Pressure Operated Compact Piston Valves https://www.valves-direct.com/product/asco-e290a471-2-2-no-g1-2-operator-diameter-50mm-entry-under-disc-series-e290-pressure-operated-compact-piston-valves/