Backup Ring for FA4 Flange Adapter, 4", 304 Stainless, Beveled x Square Style

These 304 stainless-steel back-up rings are designed for use in a variety of pipeline applications, including with HDPE butt fusion flange adapters. Sliding behind the collar of the flange adapter, they allow a variety of actuated valves and other butt fusion transition fittings to be securely installed within the pipeline. Their stainless-steel construction means they have excellent heat, corrosion, and chemical resistance. They bolt to other inline back-up rings or anchoring points. Great for use in countless applications!