To connect unthreaded galvanized piping, you will have to make use of a coupling to put the two pipes with each other. Upon getting selected the correct coupling, you must use fastening bolts and a torque wrench to keep The 2 pipes coupled. To ensure that you will get the https://www.malleableiron-pipefitting.com/industry-knowledge/how-to-connect-non-threaded-galvanized-pipes.html