TOTO Rectangular Undermount Bathroom Sink

No faucet holes in the sink. The LT191 is drilled for none, so the faucet mounts through the countertop or the wall behind it. That's normal for an undermount: you specify the deck holes when the stone or solid surface top is fabricated, and the sink itself only carries the drain and the overflow. Order the faucet and its drain assembly separately.

The LT191 is ADA compliant. At 5.3126 inches deep overall it's a shallow basin, which is what makes the required knee clearance under the counter workable when the top is set at an accessible height. Two things it does not settle for you: the faucet has to be an accessible type in its own right (the sink is drilled for no faucet holes, so that's a separate specification), and the drain and supply lines below still need to be insulated or otherwise protected.

CEFIONTECT is TOTO's fired ceramic glaze, and on the LT191 it's an ordering choice, not standard. Model numbers carrying a G (LT191G#01, LT191G#03) are the CEFIONTECT versions; the plain LT191 numbers, such as LT191#51 in Ebony, are without it. The glaze makes the china surface less prone to holding soap film and residue, which matters most in high-traffic restrooms where housekeeping passes are quick. For a low-use residential powder room the standard vitreous china finish is the simpler order. Every one of the five colors is offered both ways.

Five colors: Cotton White (#01), Bone (#03), Colonial White (#11), Sedona Beige (#12), and Ebony (#51). All five are available with or without the CEFIONTECT glaze, so a facility standardizing on one color across a building can order the same shade in either build. Cotton White and Colonial White are distinct shades, not the same white under two names, so match to the fixture code already installed rather than to the word white.

Rear overflow. That placement puts the overflow channel at the back of the basin near the wall, so it clears the front of the cabinet and doesn't interfere with a shallow drawer front. It also means the drain assembly you pair with it must be an overflow-type pop-up, not the no-overflow style, or the channel has nowhere to discharge.

Undermount, like the LT191, only works over a solid countertop material (stone, quartz, solid surface) that can hold a polished cutout edge and carry mounting clips. It's the cleaner choice for wipe-down because there's no rim catching grime at the counter line, and the rimless body here reinforces that. If the counter is laminate or a postform top, a drop-in or a self-rimming lavatory is the right call instead, because a laminate substrate won't survive an exposed cutout edge. Vanity top style also decides it: an integral cultured marble top has no cutout at all.

The sink is the china body only. You'll also need a faucet (deck or wall mount, since the LT191 has no faucet holes), a pop-up drain assembly rated for an overflow sink, a P-trap and supply stops, undermount clips or a support frame from the countertop fabricator, and silicone for the deck seal. TOTO publishes a parts sheet for the LT191 covering the components that belong to the fixture itself.

24.9 pounds. That's a one-person lift on the bench, but setting a rimless undermount from below while holding it tight to the deck is a two-person job in practice, or a one-person job with a support cradle under it while the clips are torqued and the silicone sets.