I am a DIYer. The drain connects to the main vent 24" o.c. from the floor: roof || || || || ||...............\__sink__/ ||=====O || || || || ________________________________ A different deeper sink was chosen. The bottom of this sink is 25" from the floor. The standard wall piece and P-trap don't fit. See pic. Is it permissible to extend the piece coming out of the wall vertically by about 3", to lower the P-trap? Is there by code a maximum distance between the bottom of the p-trap and the point where the drain pipe enters the wall?