At Sioux Chief we design our open flanges with the same care and precision as we do the TKO. Contractors have found the open flange to be a cost effective alternative in those instances where a test cap is not needed. These include installations after the system is tested or where no testing is performed. We complement our complete line of open flanges with five different connection types, in ABS or PVC, 1-piece or with a corrosion-resistant, 430 stainless steel swivel ring.