A vessel sink vanity base is designed to sit on or above the counter top, instead of sinking into it as a conventional bathroom sink. Vessels come in many shapes and sizes, including those which are square or in the form of a flat bottom. A vessel sink vanity base with a flat bottom will contact vanity all along the bottom with drain hole in the vessel lining up with drainage hole in vanity. This run-off, together with some adhesive will adhere to the flat-bottom vessel instead
To install vessel sink vanity base, wipe the top of the vanity around the drain cutout with a damp cloth. Remove dust or debris that could interfere with the seating of the sink. Dry the bottom of the sink as well, and both areas let dry. Test fit the vessel disc. Line up the drainage holes of the vanity top and the ship and right wash out so that it forms evenly. If the sink is rectangular and square, make sure the front of the sink is parallel to the front of the vanity top.
Remove the sink from the vessel sink vanity base top and set it aside. Drop the tail piece of the two drains through drainage holes, and use a pipe wrench to connect the tail of the P-trap of the drain extension from the wall. Wipe grease pencil mark with a damp cloth.