This may compromise the power and integrity in the joint. To stop porosity, take away the zinc coating during the weld area. Compression fittings present you with a fast and hassle-free Answer for connecting galvanized pipe without the need of threads. They consist of a entire body, nut, and ferrule. https://www.malleableiron-pipefitting.com/industry-knowledge/how-to-connect-non-threaded-galvanized-pipes.html