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dan_firkus  | 

Donald,  The Caleffi 636600A will work in piping up to 8".   Your 3" pipe installation is shown up to 208 GPM at a 1 PSID.  Please refer to the hydraulic characteristics chart in the Technical Brochure.   Also it is important to have the unit installed in a cast TEE to make sure the paddle has full travel from open to close.  That is shown in the technical brochure as well.