Installing a new vanity:
For this you would already have followed previous instructions under the heading New vanity position: and Installing a vanity waste: This is simply a description of the fit off. You have already fitted the tap ware and the plug and washer waste into the basin.
Turn the vanity cabinet around so you can transfer the measurements of the positions of the wingback barrel nipples and waste pipe elbow onto the back or up through the lower shelf as the case may be. Drill out these holes and slide or lift cabinet into position against the wall.
Please Note: The top will overhang the cupboard. Fit tidy plastic flanges to the barrel nipples and waste pipe and proceed to fit the two hot and cold flexi hoses onto the barrel nipples. And fit the trap to the plug and washer waste directly and continue from there with the bends or the straight coupling necessary to bridge the gap between the outlet of the trap and the end of the existing or new waste pipe you have provided or are in the process of installing now. Turn water on and test.
If by any chance the two flexi hoses do not reach. Bridge the gap with a couple of short elbow flexi hoses with two brass nipples in between them.