You can but it is not allowed by code. There is a maximum trap depth- I believe its 4" The reason for this is that a trap must be "self cleaning" Making it deeper allows solids to settle rather then flushing out while draining- or so I'm told...Actually I'm putting in a p trap under the bathtub, no compression fitting on this one. Can't shorten the vertical (tailpiece) pipe. I'm wanting to raise up the 90 that connections to the U
Yeh, you're losing it. He wants to do the opposite. In fact, as I understand it, he wants to make the adjustment at the trap by making it deeperAm I losing it? From that picture it looks like the tailpiece has to be extended so the back of the trap lines up with the T? I cant see anything wrong with that.