[MShaf23783]

There is currently no water access in my basement. I recently purchased a double laundry tub for which I need to establish a drain line. The attached picture shows one of the main house drains descending from the first floor. I can cut in a wye into the vertical portion of the drain just above the basement floor and then connect to the laundry tub. I may have to raise the laundry tub so that I have an adequate drainage flow. But, my questions are: 1) Are there any problems that I should be aware of in attaching a new drain line in this location? 2) Would the water in the P-Trap to be placed under the laundry tub be siphoned out by the water running down the vertical drain? Any and all responses are greatly appreciated.

[iamgrowler]

You should be able to cut in a 3x2 San-tee just above the 3" 45 coming out of the floor and install a 2" drain, 1-1/2" trap arm and 1-1/2 vent with an AAV without any problems whatsoever.