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