Pay attention to torque requirements: The coupler you utilize should have a different torque need, so consider Be aware of it as you be part of the pipes and tighten the bolts. Once the pipes are set up In accordance with your measurements, use a screwdriver to tighten the bolts. https://www.malleableiron-pipefitting.com/industry-knowledge/how-to-connect-non-threaded-galvanized-pipes.html