An Extra-Large Single Bowl For Kitchens That Mean Business
The Karran QU-670 is a quartz composite undermount kitchen sink built around an uninterrupted extra-large single bowl, giving serious cooks and busy households a wash station that handles sheet pans, stockpots, and oversized cutting boards without compromise. It undermounts beneath quartz, granite, or solid surface countertops in a clean Gray finish that anchors almost any kitchen palette.
Key Features
• Extra-large single bowl offers an uninterrupted 31-5/8" x 19-1/8" x 9" interior with no divider to limit what you can wash.
• Quartz composite construction (80% natural quartz, 20% acrylic resin) is highly resistant to scratches, stains, chips, and heat.
• Undermount design installs beneath the countertop so the surface wipes clean straight into the bowl with no rim to catch debris.
• No faucet deck on the bowl means the faucet and any accessories mount directly through the countertop for a streamlined look.
• Gray finish is a warm neutral that coordinates with both light and dark countertop materials.
Built for the Full Load, Not Just the Light Rinse
A single large bowl without a center divider is the right choice when the work in your kitchen regularly outgrows divided basins. The QU-670 accepts a full-size sheet pan flat on a bottom grid, submerges a large stockpot without tilting it on a divider wall, and gives a second person room to work beside you at the sink. For woodshop kitchenettes and cabinet shop break rooms handling tool cleanup and heavy daily use, the deep 9-inch bowl contains splash while keeping large items fully submerged. The undermount profile keeps the surrounding countertop completely clear, so wiping debris from prep work or a fabrication project directly into the bowl takes one motion.
Quartz Composite Built to Handle Daily Punishment
Quartz composite at 80% natural quartz bound in 20% acrylic resin produces a bowl that is highly scratch, stain, chip, and heat resistant in daily kitchen use. The Gray colorway runs throughout the material, so minor surface contact leaves no visible mark. Unlike stainless, the quartz surface does not show water spots or fine surface scratches from metal cookware, and it does not ring when a heavy pot lands in it. The matte texture of the Gray finish holds its appearance without polishing. Because the material is non-porous at the surface, cleaning stays straightforward. This is an indoor sink; the quartz composite construction is not rated for exterior or permanent-wet environments.
The Right Match for Fabricators, Remodelers, and Serious Home Cooks
Cabinet shops and countertop fabricators specifying sinks for client kitchens will find the QU-670 fits the conventional undermount workflow in quartz, granite, and solid surface countertops — no specialized seamless rim method required. Remodelers updating a kitchen with a 36-inch or larger sink base can drop this sink into a new stone or solid surface counter without special tooling. Homeowners who hand-wash large cookware and want a single uncluttered basin to replace a divided sink will appreciate the full interior footprint. The Gray finish is broadly versatile: it reads close to concrete and pairs equally well with white quartz, dark granite, and natural wood details.
Does this sink require a special installation method, like the Karran Q Series seamless process?
No. The QU-670 is a standard undermount sink, not a Q Series seamless model. It installs using conventional undermount methods for quartz, granite, and solid surface countertops — the same process used for any flat-rim undermount bowl. The Q Series seamless method (for laminate and solid surface) does not apply here.
Where does the faucet mount on this sink?
The QU-670 has no faucet deck, so the faucet, soap dispenser, and any other deck accessories mount through the countertop behind the bowl. Plan your countertop drilling layout before the cutout is made.
Are a drain, grid, or mounting clips included with the sink?
The QU-670 is a bare sink. A drain, bottom grid, and mounting clips are purchased separately. Confirm the grid model number for this bowl before ordering to ensure it fits correctly.
Will this sink fit a standard 33-inch sink base cabinet?
The overall dimensions are 31-5/8" x 19-1/8", so confirm the minimum cabinet size from the Karran spec sheet for this model before ordering. Overall width alone does not guarantee cabinet fit; the cutout and support method also depend on countertop material and cabinet configuration.
Is the Gray color consistent through the material or just a surface coating?
The quartz composite color runs through the material, not applied as a surface coating. Minor surface contact does not expose a different-colored substrate beneath.
A Sink That Keeps Up With the Kitchen
The QU-670 brings an extra-large uninterrupted bowl and durable quartz composite construction to kitchens and project spaces that need a wash station capable of handling full loads every day — with a clean undermount profile and a Gray finish that stays looking right with minimal effort.
