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