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.

Pipe Reducers are components in a piping system that changes the pipe size from a larger to a smaller bore. A reducer allows for a change in pipe size to meet flow requirements or to adapt to existing piping.