This line of MARZOLF? Two-Piece Flanges is designed to replace cracked or broken PVC and CPVC Van Stone flanges. Just like the with steel piping, MARZOLF? Two-Piece Replacement Flanges save money and reduce down time by eliminating the need to cut and re-glue plastic piping when installing or replacing PVC or CPVC lap joint flanges. These rings can also made of T-304L stainless steel, coated carbon steel, PVC, CPVC, and Polypropylene.