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Continue to ChatBurkert 783311 - DN40, R1 1/2, 30.9 Flow Rate KV, SS, Angle Seat Form, Type TFU002 Check Valve For Water and Air https://www.process-valves.com/product/burkert-783311-dn40-r1-1-2-30-9-flow-rate-kv-ss-angle-seat-form-type-tfu002-check-valve-for-water-and-air/