Upgrade Your Bathroom with TOTO’s New 2026 Rectangle Undercounter Lavatory – 17-11/16” x 13”

The 17-11/16” x 13” TOTO Rectangle Undercounter Lavatory (LT1554G#01) creates a continuous countertop surface that highlights clean lines while keeping the basin recessed for a more refined and minimal appearance. Built from high-quality vitreous china, this lavatory is engineered for durability, stain resistance, and long-term use in both residential and commercial applications.

Key Features

Modern Rectangular Undercounter Design

This unit features a clean, geometric basin shape designed to install beneath the countertop surface. This undercounter configuration creates a smooth, uninterrupted counterline while keeping the lavatory discreetly recessed for a more modern, high-end aesthetic.

Durable Vitreous China Construction

Made from high-quality vitreous china, this lavatory is engineered for long-term durability and resistance to everyday wear. The non-porous surface helps support easier cleaning and maintains a consistent finish over time, even in high-use environments.

Integrated Overflow Protection

The built-in overflow system helps prevent accidental water spillage by redirecting excess water back into the drain system. This adds an extra layer of protection during everyday use, especially in busy residential bathrooms.

Easy Installation with Included Mounting System

The TOTO sink includes a complete mounting assembly with installation template and hardware, helping simplify the undermount installation process. Designed for compatibility with standard countertop materials, it supports a secure and stable fit when properly installed.

Product Details

• 17-11/16" W x 13" D
• Rimless, rectangle design for undercounter installation
• Front overflow
• CEFIONTECT® ceramic glaze - prevents debris and mold from sticking to ceramic surfaces, leading to fewer chemicals and less water in cleaning
• Vitreous china
• ADA Compliant
• Mounting assembly complete with installation template and mounting screw set for wood countertops
• One Year Limited Warranty

INSTALLATION NOTES: For IoT installation, provide clearance space on left side and bottom of the controller. For left side: Minimum clearance to any surrounding structure is 13/16” (20mm). Recommended clearance is 3-15/16” (100mm) or more. For bottom side: Minimum clearance is 2” (50mm). Please refer to the spec sheet.

Since 1917, TOTO has been a global leader in bathroom innovation, known for superior quality, comfort, and design. Every Japanese toilet is crafted to elevate daily routines, delivering lasting performance and a refined, spa-like experience you'll appreciate every day.

Additional Information

• Brand: TOTO
• MPN: LT1554G#01
• Waste: 1-1/4"
• Size: 21-3/16" W x 14-15/16" D x 7-3/16" H
• Basin: 17-11/16"W x 13"D
• Basin Depth: 5-5/16"
• Material: Vitreous China

Read our article to learn more about the new products TOTO’s released in June 2026! 

TOTO Rectangle Undercounter Lavatory FAQ

What type of installation is the TOTO Rectangle Undercounter Lavatory designed for?

The LT1554G is designed for undermount installation, where the lavatory is secured beneath the countertop rather than sitting on top of it. This creates a smooth, continuous surface that enhances the overall design while also making it easier to wipe debris directly into the basin without catching on exposed edges.

What is the TOTO lavatory sink made from, and why does it matter?

The rectangle sink is constructed from vitreous china, a high-fired ceramic material known for its strength, density, and long-term durability. Its non-porous surface helps resist staining, discoloration, and moisture absorption

Does the TOTO Rectangle Undercounter Lavatory include overflow protection?

Yes, this lavatory includes an integrated overflow channel that helps prevent water from spilling over the rim. If the basin becomes overfilled, excess water is safely redirected through the overflow system into the drain.

Is TOTO’s lavatory compatible with most countertop materials?

Yes, the LT1554G is designed to be compatible with a wide range of countertop materials, including quartz, granite, solid surface, and other engineered stone surfaces. Proper undermount installation is required using the included mounting hardware or a recommended installation system for secure support.

Will TOTO’s lavatory sink fit my bathroom project?

Yes, it is designed for undermount installation and can be used with many countertop materials and vanity styles.

Be sure to verify cutout dimensions and installation requirements before purchasing. If you need help determining whether this sink is the right fit for your project, call our customer service team at 888-682-5956 (toll-free)!

Weight	26.0 lb
Certifications	ADA
Color	White
Faucet Holes	0
Finish	Cotton
Finish Type	Polished
Height	8.25 in.
Installation Type	Undermount
Length	17.75 in.
Material	Vitreous China
Number of Faucet Holes	0
Room	Bathroom
Shape	Rectangular
Type	Undermount
Width	13.00 in.
Inventory Number	TOTLT1554G-01
MPN	LT1554G#01

• Spec Sheet