Threaded Both Ends (TBE) Pipe Nipples are short lengths of straight pipe with male threads on both ends used to connect two pieces of straight pipe within a piping system.

A merchant coupling is a fitting used to join pipes, of similar size, together in a straight-line run. Merchant steel fittings are designed with Dryseal Taper Threads (NPTF) for more critical applications. NPTF Dryseal threads produce a mechanical seal by the mating and slight crushing of the threads when a wrench is applied to tighten the fittings.