In this video we’ll be cutting out a rotted waste nipple and remove old galvanized pipe.

So you reach under the kitchen sink to grab some paper towels or some dish soap and everything is soaking wet. You open up the doors to take a closer look and you notice a rust stain running down from where the waste pipe exits the cabinet.

Upon further investigation, you realize that the bottom of that nipple is all rotted out and has probably been leaking for some time. Welcome to my world guys!

You think to yourself “all I have to do is get under the sink with my trusty pipe wrench, remove and replace the offending piece of pipe, right?” Not so fast my friends…the pipe may be rotten where it connects to the “P” trap but inside the wall it’s fully intact so there is no way that piece is going to screw out. If you don’t believe me I’ll hang out a bit and wait for you to prove me wrong….

How’d it go?

I know. The reason it rotted out under the cabinet is because the nipple is galvanized iron and the trap is made of brass thus creating something called electrolysis which happens when you join two dissimilar metals together.

Over time, the iron nipple will just rot and always end up leaking.

If the piece inside the wall is screwed into a galvanized fitting, it’s fully intact and short of placing a two foot wrench on it, I can pretty much guarantee it’s not going to move.

Enough talk, watch the video as I take you step by step on how to remove offending piece.

FYI, I referenced the Sawzall blade in the video to be 18 TPI (teeth per inch) and realized after the shoot that it was in fact 10 TPI .

They’ll both work but if this is your first attempt at this I’d go with the 18. If after watching the video you still have questions you know how to reach me, info@bobsplumbingvideos.com.

HAPPY PLUMBING!