Home / Catalog / FM - Factory Mutual Approved for Polyethylene Pipe / Factory Mutual (FM) Approved To Fit HDPE DIPS Flange Adapters Factory Mutual (FM) Approved To Fit HDPE DIPS Flange Adapters Factory Mutual (FM) Approved Carbon Steel Flanges to Fit High Density Polyethylene (HDPE) DIPS Pipe (11) Factory Mutual (FM) Approved T-316L Stainless Steel Flanges to Fit High Density Polyethylene (HDPE) DIPS Pipe (11) Request Information