I bought my EKO used and it showed up with only one flange, so today I had another flange fabricated by a local welder I saved money by keeping it square, for shits and giggles take a look. It threaded to the black pipe nice, it took 45 minutes to complete and cost 50$ I am currently still piping so the collar length had no effect on piping lengths to the rear of the EKO..Are large EPDM pump like gaskets being used on these flanges?? Dave