Flanges shall be drilled to ANSI B16.5 150/125 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. Temperature -66F to +272F. Working Pressure (at atmospheric) 450PSI. For Gasket Seal all loose dirt, scale and grease must be removed to ensure a leak-tight seal and the tube surface needs to be free of any marks or indentations.