waterpipes for 3/4 CPVC, except for the drop downs. It is important to know the type of coupling to use for galvanized pipe and the fitting procedure so the pipe is leak free. Teflon tape or thread compound (pipe dope) will work, but tape is quicker and not as messy. Good luck! Next, connect copper pipes together until you reach the galvanized pipe threads. This helps solid materials flow by the connection without getting hung up. Arrange the fittings so the water flows past the threads on the male fitting, not into them. Connecting CPVC to Galvanized; Author: mwalsh (FL) I am remodeling a house and the feed from the street is galvanized with a 3/4" nipple. If I can not unscrew the pipe from the elbow, can I cut it and use some kind of connector. Pipe is 1/2'. Plastic to metal connections are made using threaded connections. Apply pipe thread tape before screwing them together, and then glue the pipes into the fittings using the proper cement. Use this link for more information on connecting abs to pvc. Connecting together galvanized pipes that are non-threaded uses a coupling that creates a sealed joint. If you do connect copper pipe to galvanized pipe, you will need a dielectric coupling or else the galvanized pipe will corrode. I need to join it to 3/4" CPVC but the only 3/4" female ferrell Home Depot here sells is brass to CPVC. These are designed for pressure pipe, the size designed for 1/2" galvanized pipe also fits 3/4" copper. I am trying to connect new cpvc to old Galv. Galvanized pipe has a zinc coating that is either rough or smooth depending on the type of zinc and steel heating process. They make fittings that we call "Moody Couplings"; this may be a regional or colloquial term but probably evolved from a manufacturer's name. Do not use a plastic female threaded connector with a metal male connector! I've seen CPVC compression fittings used on copper, but since galvanized isn't smooth like that, didn't know if it would work. I'm not sure that I can unscrew the pipe feeding down to the tub spout, otherwise I'd be able to just use a threaded fitting. Same with connecting galvanized pipe to brass fittings. 99.99% of all PVC female threaded adapters that have male threaded galvanized pipe threaded into them will have duct tape and mighty putty applied to the joint as well in an effort to stop the leaking connection. I am concerned that the different metals will cause corrosion. Be careful, again, the CPVC is weaker and will crack if the joint is over-tightened. Piping. Although galvanized pipe is ancient technology for water pipes, for the time you are talking about, it will be fine. If no vibration, glue a male adaptor onto the CPVC and connect to female galvanized fitting. Galv. Thanks for any help you can give me. 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