ACU-TECH™ HDPE Blind Flange | ANSI 150 The HDPE Blind flange | ANSI 150 is a backing Flange that has been designed for covering or closing the end of a pipe Range of Sizes Available:63mm110mm160mm225mm315mm355mm400mm500mm ACU-TECH™ HDPE Blind Flange | ANSI 150Size in mm*Select