Forum Title: Prep cast iron for no hub couplings
What's the best way, or preferred way to prep an underground / underslab cast iron waste line for new no hub couplings? I'm tying into and replacing a section of 2" CI waste, and there is scale / build up on the pipe - wondering what the best prep is to provide a smooth surface for the new no hub couplings. Any thoughts and experience is greatly appreciated! Thanks
Category: Plumber Post By: PEDRO VALDEZ (Dunedin, FL), 06/11/2017

Sometimes I find a layer of scale and dirt that I have to tap off with a hammer . tap to hard and you crack the old pipe. chip off any lump with a metal putty knife. I have also use a very coarse rasp to clean bottom side that are hard to reach with a scraper. Fitting brush (type for cleaning copper fitting) in a drill also helps. one big problem with some old cast iron is it is truly cast and can have a seam from the casting mold. use a grinder or a stone wheel in a drill to smooth it out. When its really bad, I cheat and put some pipe dope on the inside of the coupling. Mission coupling neoprene is a little thicker than no-hub coupling and can seal a little better on the old cast. If you are installing plastic then you will want to use the mission bands anyway as transition coupling

- JAIME RAMSEY (Downers Grove, IL), 09/24/2017

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