Laundry tub install - PROBLEM

After getting advice from some of you, I thought installing a laundry tub would be relatively easy. Ha
I got a good look at the situation in our new (to us) home we are going to move into Friday.
At the top where the washer drain pipe and hot and cold water outlets are, is a plastic plate that all three are joined to - actually molded to.
It appears I would have to tear something up to put a tee in the drain pipe.
I am wondering about two other options:
    1) Cut through the wallboard at a low enough point, cut a hole in the drain pipe and "somehow" fasten a fitting in the hole in the drain pipe.
    2) Use a small electric pump to empty the tub.
Any suggestions?
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Weldon Wallick wrote:

I don't often say this, but I think you're out of your depth on this project...
Jim
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So everything is in a molded box in the wall. Not a biggie. But not going to be simple either. You will need to remove the washer and dryer. Measure the bottom of the sink from the floor. Now subtract 10 inches or the amount of the collar and the "P" trap. Depending on how far away you are from the drain for the washer. You now must figure out a 1/4 inch per foot drop from the drain pipe to the tub for all of the horizontal waste run. Cut the wall and remove the drywall. blow this line. Cut the dry wall parallel to the floor based on the high point. Cut the studs in the wall and then cut in the sewer ell, to the drain. Should be something like 1.25 inch or larger. Do not use a standard "T" fitting. You want the curve to help direct the water flow down. Buy and put in the metal straps over the holes you cut and replace the drywall. Now that the wall is open you can also run the water pipes over to the sink. tape texture and paint.
I did one of these 4 years ago. Everything was exposed on a block wall. Bought the fiberglass tub from the depot and spent the better part of the weekend installing it. Plumbing is not my favorite job. I always forget something and back to the store I go.
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