TOTO 19" x 12-3/8" Rectangular Undermount Bathroom Sink with CEFIONTECT

No holes at all. The LT542G is drilled with no faucet hole spacing, which is normal for an undermount bowl: the faucet gets drilled into the countertop or mounted on the wall behind it. You need to decide the faucet layout when the top is fabricated, since single hole, 4 inch centerset and 8 inch widespread are all counter decisions here, not sink decisions.

The LT542G is ADA compliant as a fixture. What that does not do is make the installation compliant on its own. Mounting height, knee and toe clearance under the counter, and drain and supply pipe protection are all set by how the vanity is built and where it is hung. The sink being an 8-1/8 inch tall bowl matters for that clearance math, since it hangs below the deck and eats into the knee space.

An undermount like the LT542G mounts under the counter, so the deck runs unbroken to the bowl edge and you can wipe water straight in. That requires a solid surface top, stone or quartz, cut and polished for the bowl, plus clips and a fabricated cutout. A drop-in sets into the hole from above with its rim covering the cut, so it works on laminate and needs no polished edge, and it is the faster swap on an existing top. If the top is already cut for a drop-in with faucet holes in the china, this rimless bowl is the wrong direction unless you are replacing the counter too.

Front overflow. That puts the overflow channel at the near side of the bowl rather than at the back. Practically it means you want a grid drain or pop-up assembly built for an overflow sink, not a sealed-body drain intended for a bowl without one. If the drain body blocks the overflow port, the overflow stops working.

Two: Cotton White, ordered as LT542G#01, and Sedona Beige, ordered as LT542G#12. The suffix after the hash is the color, so if you are matching other TOTO fixtures already in the building, the #01 or #12 code on those toilets and lavs carries straight across to this sink.

The sink stands 8-1/8 inches tall overall, and essentially all of that hangs below the countertop on an undermount install. Measure from the underside of your top down to the wall drain stub before ordering: you need that 8-1/8 inches plus room for the tailpiece and the trap arm. In a shallow cabinet or over a wall drain roughed in high, that is the dimension that decides whether it fits.

CEFIONTECT is an extra-smooth glaze fired into the ceramic on the LT542G. The surface has far less texture for soap scum and waste to grab, so the bowl stays cleaner between cleanings rather than needing scrubbing to look right. It is part of the fired surface, not a coating that wears off, but it is still ceramic glaze, so keep abrasive pads and scouring powders off it. For a property manager running a turn schedule, that is the point of it: less cleaning labor per bowl.

About 19 pounds. That is a one-person lift, but an undermount is not a one-person install: the bowl has to be held up flat against the underside of the top while the clips and sealant are set. Budget a second set of hands or a support cradle under the counter while it cures.