PRO-SAFE Galvanized Structural Pipe Fitting, Malleable Iron: Wall Flange for 1-1/2" Pipe. Priced and sold as each (1). PRO SOURCE structural slip-on pipe fittings are a great solution for custom installs of racks, guard rails, tables, and railings. Fully reusable galvanized iron fittings do not require pipe threading for assembly. Use with standard 1-1/2 inch pipe: the only tool you need is a hex key!