Screwing a male threaded piece of galvanized into a female threaded PVC adapter is just plain bad news and guaranteed to be a leaker. Galvanized pipe has a zinc coating that is either rough or smooth depending on the type of zinc and steel heating process. I've seen CPVC compression fittings used on copper, but since galvanized isn't smooth like that, didn't know if it would work. Arrange the fittings so the water flows past the threads on the male fitting, not into them. How to Connect Plastic Pipe to Metal Pipe . If no vibration, glue a male adaptor onto the CPVC and connect to female galvanized fitting. 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. These are designed for pressure pipe, the size designed for 1/2" galvanized pipe also fits 3/4" copper. I am concerned that the different metals will cause corrosion. If I can not unscrew the pipe from the elbow, can I cut it and use some kind of connector. A plastic male thread is used to connect to metal female threads. Be careful, again, the CPVC is weaker and will crack if the joint is over-tightened. Teflon tape or thread compound (pipe dope) will work, but tape is quicker and not as messy. 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 replacing old gal. Do not use a plastic female threaded connector with a metal male connector! Plastic to metal connections are made using threaded connections. It is important to know the type of coupling to use for galvanized pipe and the fitting procedure so the pipe is leak free. Galv. I am trying to connect new cpvc to old Galv. Piping. waterpipes for 3/4 CPVC, except for the drop downs. Apply pipe thread tape before screwing them together, and then glue the pipes into the fittings using the proper cement. This helps solid materials flow by the connection without getting hung up. Good luck! Complete the connection with a pair of wrenches, one to hold the female pipe securely, the other to turn the male pipe. Thanks for any help you can give me. The joint will almost always leak or break. Sweat on the copper part of the dielectric fitting, which is threaded, coat all the threads with tape or pipe compound and screw them together by tightening up the fitting with your wrench. Next, connect copper pipes together until you reach the galvanized pipe threads. Although galvanized pipe is ancient technology for water pipes, for the time you are talking about, it will be fine. I need to join it to 3/4" CPVC but the only 3/4" female ferrell Home Depot here sells is brass to CPVC. If you do connect copper pipe to galvanized pipe, you will need a dielectric coupling or else the galvanized pipe will corrode. 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. Do I need a inspection for this job? Connecting together galvanized pipes that are non-threaded uses a coupling that creates a sealed joint. Pipe is 1/2'. They make fittings that we call "Moody Couplings"; this may be a regional or colloquial term but probably evolved from a manufacturer's name. Use this link for more information on connecting abs to pvc. Metal male connector depending on the male pipe to use for galvanized pipe threads not into them and glue! Cpvc but the only 3/4 '' female ferrell Home Depot here sells is brass to CPVC made using connections... Drop downs old Galv adapter is just plain bad news and guaranteed to be leaker... 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