Couplings are A further well known option for connecting galvanized pipe without the need of threads. They come in several sorts, which include slip couplings, press-fit couplings, and compression couplings. The set up approach differs a bit based on the style of coupling made use of, but usually requires: Double-Check: https://www.malleableiron-pipefitting.com/industry-knowledge/how-to-connect-non-threaded-galvanized-pipes.html