A 31-3/4 Inch Quartz Undermount Sink for Gray-Toned Kitchen Designs

This Karran single-bowl undermount sink is a quartz-composite kitchen sink in Gray, sized to fit a 36-inch base cabinet and designed to mount beneath granite, quartz, or solid surface countertops.

Key Features

• Single bowl in Gray quartz composite, a neutral tone that pairs naturally with stone, concrete-look, and two-tone kitchen palettes.
• Undermount installation into granite, quartz, or solid surface countertops.
• Minimum 36-inch cabinet width required with a 31-3/4 inch overall length and 9-inch bowl depth.
• 3-1/2 inch drain opening for standard kitchen drain and disposal fittings.
• cUPC and IAPMO certified quartz construction.

Where a Gray Sink Fits the Kitchen

Gray is the finish decision that does the most work in a mixed-material kitchen. It bridges a white or cream cabinet to a darker stone countertop, stays neutral next to stainless appliances, and reads as a natural match under concrete-look or gray-veined quartz. A single deep bowl keeps the basin open for large pots, sheet pans, and oversized cutting boards without a divider interrupting the workspace. The 9-inch interior depth adds enough clearance to keep splatter inside the bowl while still feeling accessible for everyday washing tasks.

Quartz-Composite Construction

The sink body is quartz, a dense, engineered composite that provides the substantial look and feel of natural stone. The Gray finish runs through the material consistently, so chips or scratches at the rim edge do not expose a different color beneath. Quartz composite also holds up well against the temperature changes that come with rinsing hot pans and filling with cold water. The cUPC and IAPMO certifications confirm the sink meets the plumbing-code requirements most residential and commercial projects expect.

Planning the Install

This sink goes in at the countertop fabrication stage. It is an undermount, which means the countertop cutout must be made to accept it from below, and the countertop material must support undermounting. Granite, quartz, and solid surface are the confirmed compatible surfaces. The sink requires a base cabinet at least 36 inches wide, and the interior bowl runs 29 inches long by 16-3/8 inches wide, so verify both the cabinet width and countertop cutout dimensions before the stone is templated. A remodel that is replacing an existing sink with a different sink type will need new countertop fabrication, not just a cutout swap.

Common Questions

A Gray Undermount Bowl That Works Across Kitchen Styles

For a new or remodeled kitchen where the countertop is granite, quartz, or solid surface and the palette calls for a neutral gray sink, this Karran single bowl delivers the right depth, the right footprint, and certified quartz construction.