I would like to add a wash machine to the basement. Near the area of the basement where I'll be adding it is a 4 in drain coming from an upstairs toilet. Can I tap the new drain into the toilet drain?
Connect a drain for the new washing machine to an existing toilet drain
draintoilet
Related Solutions
a toilet needs either a large drain pipe or a fecal grinder that prevents fecal matter and toilet paper from clogging it up
that or it needs to be a urinal
Ideally, you should move the P-trap upstairs, and vent through the roof. Under no circumstances should you have two p-traps in one line. You get an air-lock between the two, and funny stuff happens.
You want something like this:
Best Answer
You can tap in to the existing stack to drain, the only issue (like bcworkz said above) is you need proper venting. If you were to tap in to that stack without a vent, you could potential pull the water out of any traps above (via suction).