We advise if galvanized pipes are existing, you concentrate on owning them replaced by a qualified plumber. When the pipes are in place Based on your measurements, make use of a screwdriver to tighten the bolts. When you tighten the bolts, they’ll secure the pipes into area In the coupling. https://www.malleableiron-pipefitting.com/industry-knowledge/how-to-connect-non-threaded-galvanized-pipes.html