Thank you to all the plumbing professionals who offer their advice and expertise
Welcome to Plbg.com

Over 550,000 Posts in over 160k Threads

Welcome to Plbg.com (aka: PlumbingForum.com) we are the most popular plumbing information sharing, advice, DIY and educational forum on the Web. Ask any toilet, sink, faucet, pump, water quality, and plumbing related questions. Please refrain from asking where to purchase a product, business, pricing, or legal questions, for contractor referrals, or any questions not related to plumbing. Keep all positive and no advertising. This site is free and made possible by:  

Post New
Search
Log In
How to Show Images
Newest Subjects
 Tap into sewer pipe
Author: Livid Larry

I am putting a toilet in basement.Have 4" cast iron pipe under the concrete floor which I have to tap into. Which is the best way to go ?

Post Reply

 Re: Tap into sewer pipe
Author: Dunbar (KY)

Tap into this line......make sure the toilet is vented and tied into an existing vent stack on the same level or you will have to take it up to the roof.


You cannot tie into an existing drain stack for venting reasons.

Post Reply

 Re: Tap into sewer pipe
Author: hj (AZ)

It is not a matter of the best way. There is really only one way. You have to cut a piece out of the pipe and insert a proper fitting, then connect the basement plumbing to it. You also have to consider the proper venting for those fixtures.

Post Reply

 Re: Tap into sewer pipe
Author: Livid Larry

This tap in will be approx. 3 feet from vertical stack. Will this take care of the venting?

Post Reply

 Re: Tap into sewer pipe
Author: hj (AZ)

NO! The only thing that will take care of proper venting is a proper vent.

Post Reply

 Re: Tap into sewer pipe
Author: HytechPlumber (LA)

If the stak you are referring to is the main sewer stak then you can tie in a tee into the stak below the slab. Then the line can run and catch your toilet with a wye and closet bend, then continue on and turn up with long sweep in your lavatory wall. The lav can be caught on this pipe (wetvent)and it will be your toilet vent and must either go thru the roof independently, or tie into existing vent on upper floor approx. 48" above floor level. Sometimes an added vent can be hidden in corner of locker. In my area a vent for a toilet must be 3", some areas allow 2". Some areas allow "vent cheks" or "studor vents" which I amm not very fond of, yet, it is a consumer option. GOOD LUCK

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:




Special thanks to our sponsor:
Buy plumbing supplies online


Copyright© 2015 Plbg.com. All Rights Reserved.