TOTO 21-1/4" x 14-3/8" Large Rectangular Undermount Bathroom Sink with CEFIONTECT

Cut the counter opening at 21-1/4 by 14-3/8 inches. Those are the same numbers as the basin itself, so the bowl drops straight into the opening with the rimless edge sitting under the stone. Allow 7-7/8 inches of depth below the underside of the counter for the bowl, and figure the overall ceramic footprint at 23-1/4 by 16-3/8 inches, which is what has to clear the sink rails or cabinet sides in the vanity.

No holes. The LT540G is an undermount bowl with no faucet deck, so the faucet drilling happens in your countertop or the faucet mounts to the wall. That means you pick the hole layout, single hole or 4 inch centerset or 8 inch widespread, when the top is fabricated. Order the faucet before the counter goes to the fabricator so the drilling matches.

Yes, the LT540G is ADA compliant. The bowl is 7-7/8 inches deep, which is what lets it be set under a counter at accessible height while still leaving knee clearance underneath. Compliance in the finished installation still depends on your mounting height and the pipe protection under the bowl, but the sink itself is the right piece for an accessible lavatory.

The overflow sits at the front of the bowl, on the user side rather than the back wall. Because it has an overflow, use a pop-up or grid drain built for an overflow sink, not a solid non-overflow drain body. Front placement also matters for the plumber: it keeps the overflow channel clear of the tailpiece run at the back of the cabinet.

Two glaze colors: Cotton White, which is TOTO's #01 code and orders as LT540G#01, and Sedona Beige, TOTO's #12, ordering as LT540G#12. Those are the same color codes TOTO uses across its toilets and lavatories, so if you are matching a bowl already in the building, read the suffix off the existing fixture and order the sink to match it.

Undermount is the call when the counter is stone or solid surface and you want no rim to trap debris at the counter line. The LT540G is rimless, so the counter runs straight into the bowl and a rag pushes water in with nothing to catch on. The trade off is fabrication: the top has to be cut, polished at the edge, and drilled for the faucet, and swapping the bowl later means pulling the counter. Drop-in makes more sense on a laminate top, or where the maintenance crew wants to change a bowl without disturbing the counter.

The bowl only. There is no faucet, no drain assembly, and no P-trap in the box, and no faucet is drilled into the sink. To complete an opening you need a faucet, a grid or pop-up drain built for an overflow sink, a trap and supplies, mounting clips or a support rail suited to your countertop material, and silicone. On an ADA lavatory add insulation wraps on the trap and hot supply.

CEFIONTECT is TOTO's glaze treatment. It is fired into the ceramic surface so waste has less to grip, which keeps the bowl looking clean between cleanings. Practically, for a property manager or a janitorial crew it means a lighter cleaning routine, and no abrasive pads or scouring powders, since anything that scratches the glaze is what you are paying for here.

25.5 pounds of vitreous china. That is a one-person lift on the bench, but an undermount bowl has to be held up against the underside of the counter while the clips and adhesive cure, so it is a two-person set, or a one-person set with a support cradle under the bowl. Confirm the counter is rated to carry it before the top is drilled for clips.