A Deep Single Basin Built for the Full Wash Load
The Karran QU-670 is an extra-large single-bowl quartz composite kitchen sink designed for undermount installation in quartz, granite, and solid surface countertops. With an uninterrupted basin and a 9-inch depth, it handles everything from soaking stock pots to rinsing full sheet pans without the compromise of a divider.
Key Features
• 80% quartz / 20% acrylic resin construction gives the bowl high resistance to scratches, stains, chips, and heat.
• Extra-large single bowl provides an uninterrupted 31-5/8" x 19-1/8" workspace for oversized cookware and sheet pans.
• 9-inch bowl depth accommodates tall pots and deep soaking without splashback on the surrounding counter.
• Flat mounting rim with no faucet deck positions the sink cleanly beneath the counter edge, with the faucet mounted through the countertop.
• White finish is molded throughout the quartz composite, so minor surface wear does not expose a different underlying color.
• Undermount installation leaves a wipe-clean counter edge with no rim to trap food debris or moisture.
Where the Single-Bowl Layout Earns Its Place
A divided sink makes sense for two-station workflows, but the QU-670 is built for the cooks and households that prioritize uninterrupted capacity. Sheet pans, Dutch ovens, and large cutting boards drop in flat without fighting a center divider. For kitchens that hand-wash oversize cookware regularly, the single basin converts from a soaking station to a full rinse zone in seconds. Cabinet shops and contractors specifying for kitchen renovations will find the 31-5/8-inch overall length fits a standard 33-inch sink base with clearance to spare on each side, and the undermount path keeps the countertop edge clean for stone and solid surface finishing.
Quartz Composite Construction and White Finish
Karran's quartz composite is an engineered blend of natural quartz crystals and acrylic resin, and it performs differently from a coated or enameled sink. The color runs through the full body of the material, so the White finish does not chip down to a contrasting substrate. The surface resists the abrasion of scrubbing pads, the thermal impact of hot cookware set directly in the basin, and the staining that plagues lighter-colored sinks in busy kitchens. Because the QU-670 is a QU series model, it is a conventional undermount rather than a seamless installation — it mounts beneath quartz, granite, and solid surface countertops using appropriate clips and fasteners for the countertop material, with the faucet drilled through the counter behind it.
Right Fit for This Sink
The QU-670 suits primary kitchen stations where maximum basin space matters more than a divided layout. It is a strong specification for open kitchen renovations with stone or solid surface countertops, where the undermount mount and clean counter edge reinforce the finished look. Custom cabinet shops building sink bases for quartz or granite tops will appreciate the flat mounting rim geometry. Homeowners stepping up from a smaller divided sink to a single extra-large bowl typically find the transition permanent — once the full footprint is available, returning to a divider feels like a downgrade. This sink is intended for indoor residential and light commercial applications.
Does the QU-670 come with mounting clips or a paper template?
The QU Series specification sheets state that neither the template nor mounting clips are included with this sink. Your countertop fabricator will determine the appropriate clip and fastener system for the countertop material — stone, quartz, and solid surface each use a different attachment method.
Where does the faucet mount on this sink?
The QU-670 has no integrated faucet deck, which is standard for this series. The faucet, soap dispenser, and any accessories mount through holes drilled in the countertop behind the bowl. Discuss hole count and placement with your fabricator before the countertop is cut.
What countertop materials work with this sink?
The QU series is documented for undermount installation in quartz, granite, and solid surface countertops. It is not a seamless-capable series — that capability is specific to Karran's Q Series. For laminate countertops with a seamless finish, the Q Series would be the appropriate choice.
Is the White finish durable enough for a high-use kitchen?
The White color is carried through the quartz composite material rather than applied as a surface coating. Karran describes the material as highly scratch, stain, chip, and heat resistant, so it holds up to daily kitchen use without the risk of chipping down to a contrasting layer underneath.
What drain opening does this sink use?
Kitchen sinks in this line use a standard 3-1/2 inch drain opening. A basket strainer is sold separately — confirm the correct strainer for this model before purchasing.
A Kitchen Sink Scaled for Real Cooking
The QU-670 gives working kitchens the basin size they actually need — deep enough for a tall stockpot, wide enough for a full sheet pan, and finished in a material that holds its White color through years of daily use. For any kitchen where the sink is a true workhorse, not just a fixture, this is the right scale to start with.
