The purpose of the floor flange is to secure pipe to the floor or wall. Made of malleable iron for superior tensile strength and designed to resist rust.
Made of Malleable iron which is designed for high tensile strength. National Pipe threads provide a tight seal, complete with a black finish to resist water, air, and steam.
Made of steel tubing. Merchant couplings are used often in low pressure piping situations, like with water, oil, air or gas lines. They function by connecting straight pipe to straight pipe.
Malleable black iron pipe fittings. Larger size listing is for Male thread. Small size listing for Female thread. Ferrous Plugs, Bushings, and Locknuts, Fed. Spec. WW-P-471-B, ANSI B-16.14 (Dimensions), ANSI B-2.1 (Pipe Threads).