We are installing a new taller vanity. The opening cut into the rear by the manufacturer is higher than the existing wall connection and trap. To get the vanity to fit against the wall, I need to do a 90 degree angle immediately leaving the wall drain and go up. I would make the opening larger, but there are also two drawers on the bottom and a shelf above the drawers. The rear opening is above that shelf.
I can do all the plumbing and connections, but I need a diagram to the trap to accomplish correctly. How best can I accomplish the 90 angle using PVC leaving the wall drain opening. I have room for only a 3.5 inch stub leaving the wall. Is it OK to run a 90 degree bend at that location and do I need a stub segment going into the wall drain or can I connect directly with no stub?
Typically, most plumbers push the PVC pipe into that wall opening by 3 or 4 inches to ensure strength and no leaks.