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Continue to ChatASCO E290A399 - G1/2, NC, DN15, Operator Diameter 50mm, entry above disc, Series E290 Pressure Operated Piston Valve https://www.valves-direct.com/product/asco-e290a399-g1-2-nc-dn15-operator-diameter-50mm-entry-above-disc-series-e290-pressure-operated-piston-valve/