cut old 4" cast iron drain pipe

Over 698,000 strictly plumbing related posts

Plumbing education, information, advice, help and suggestions are provided by some of the most experienced plumbers who wish to "give back" to society. Since 1996 we have been the best online (strictly) PLUMBING advice site. If you have questions about plumbing, toilets, sinks, faucets, drains, sewers, water filters, venting, water heating, showers, pumps, and other strictly PLUMBING related issues then you've come to the right place. Please refrain from asking or discussing legal questions, or pricing, or where to purchase products, or any business issues, or for contractor referrals, or any other questions or issues not specifically related to plumbing. Keep all posts positive and absolutely no advertising. Our site is completely free, without ads or pop-ups and we don't tract you. We absolutely do not sell your personal information. We are made possible by:

Post New

How to Show Images

Newest Subjects

cut old 4" cast iron drain pipe
Author: jay73 (IN) I have an old 4" cast iron sewer drain in crawl space. Currently only a 2" PVC (horizontal) line is able to connect to it. [photos.app.goo.gl] I'm thinking of cut the 4" CI line so I can use 3" or larger PVC pipes. I think it is stacked by lead band, but it would be nice if I don't have to cut it. Any suggestions? Edited 1 times.
Post Reply

Re: cut old 4" cast iron drain pipe

Author: Don411 (IN)

If you can remove that cast iron reducing fitting (the one with the 20 amp wire resting on it and the XH stamped on it) that would leave you with a 4" cast iron hub. That hub is the bottom piece of the assembly and says "4 XH" on it. Use a Fernco donut fitting like this in the fitting and insert 4" PVC right into it. Once you go up and turn horizontal with the 4" then you can add in the existing 2" PVC with a wye fitting.

Cutting that old pipe is a bear so removing that reducer from the existing hub will likely be easier. The pros will chime in shortly on recommended tools and techniques.

Edited 1 times.

Post Reply

Please note:

Inappropriate messages or blatant advertising will be deleted. We cannot be held responsible for bad or inadequate advice.
Plbg.com has no control over external content that may be linked to from messages posted here. Please follow external links with caution.
Plbg.com is strictly for the exchange of plumbing related advice and NOT to ask about pricing/costs, nor where to find a product (try Google), nor how to operate or promote a business, nor for ethics (law) and the like questions.
Plbg.com is also not a place to ask radiant heating (try HeatingHelp.com), electrical or even general construction type questions. We are exclusively for plumbing questions.

Search for plumbing parts on our sponsor's site:

Plbg Advisor List Common Plumbing Terms Find A Plumber Plumbing Manufacturers Directory theplumber.com

Special thanks to our sponsor:

to FAQ's - to popular subjects - to plumbing books - to Tankless 101 - to plumbing history - to helping charities - to contact us