I need to transition from ABS to existing Galvanized DWV pipe. The Vent portion of the Galvinzed is in perfect shape but the drain side is corroded. While I have the plumbing exposed I am taking out the drain galv and replacing with ABS. Is it OK to use a female slip/ male threaded ABS fitting to tie into the steel Galvanized. They are the same thread and it will screw into the galvinzed.