CTS Copper Flange Roll Grooved Flanges shall be drilled to ANSI B 16.5 150/125 Standard powder coated with a EPDM insulator adhered to the plate steel flange protruding inside of the steel flange to prevent contact with the Copper Companion Flange Adapter. copper_flange_rgrooved_150Download Share this:TwitterFacebookLike this:Like Loading...