An Offset Bowl Layout Built Around the Way Kitchens Actually Work
The Karran U-6040R-PK1 is an 18 gauge stainless steel undermount kitchen sink in a 60/40 large/small bowl configuration, measuring 31-1/2 by 20-1/8 inches overall. The large bowl carries the heavy lifting of daily wash and rinse while the smaller right-side bowl handles prep and disposal duty, and this kit includes basket strainers and bottom grids so the setup is ready to go from the first install.
Key Features
• 18 gauge stainless steel construction delivers a solid, quiet bowl that holds up to daily kitchen demands.
• 60/40 large/small bowl layout with right-side small bowl pairs a roomy primary wash basin with a dedicated prep or disposal station beside it.
• Undermount installation positions the rim below the countertop for a clean wipe-clean edge and an unobstructed work surface above.
• Kit includes stainless steel basket strainers, bottom grids, and Luster Pro oil so no additional accessory sourcing is needed before the first use.
• Soft satin brushed finish blends with a wide range of cabinet styles and resists the appearance of water spots and light scratches in everyday use.
• 31-1/2 by 20-1/8 inch footprint suits standard 33 inch and larger sink base cabinets.
Two Bowls, One Workflow
The 60/40 split exists because most kitchens run two tasks at once. The larger left bowl takes full sheet pans, stock pots, and oversized cutting boards without the divider cutting into usable space. The smaller right bowl sits above a disposal or holds a colander for draining pasta while the main bowl is still in use. That physical separation keeps prep and cleanup from colliding at the same basin, which matters most during high-output cooking or evening cleanup with multiple people at the counter. Undermount positioning means the countertop edge is finished, continuous, and easy to wipe clean from the surface directly into the bowl.
Stainless Construction and Kit Contents
The U Series is built in 18 gauge stainless steel with a soft satin brushed finish. The gauge gives the sink enough wall thickness to feel substantial without the premium price of a 16 gauge model, and the brushed surface hides the hairline marks that accumulate on a working kitchen sink over time. Because this ships as a -PK1 kit, the box includes stainless steel basket strainers matched to both bowls, bottom grids for each bowl, and a bottle of Luster Pro oil for initial care. The drain opening size and plumbing connection details are in the structured spec block on this page.
Where This Sink Fits Best
This sink is well matched to a remodel or new-build kitchen with quartz, granite, or solid surface countertops, where undermount installation is the standard approach and a wipe-clean counter edge is part of the design intention. Cabinet shops specifying a practical, finish-ready sink for a mid-range kitchen project will find the included grids and strainers reduce the accessory list. The right-side small bowl orientation suits kitchens where the disposal is plumbed to the right and the primary work runs left, which is a common configuration in U-shaped and galley layouts. Homeowners who hand-wash frequently will also appreciate the full-width separation the 60/40 layout gives between the wash and rinse sides.
Does the small bowl land on the right or the left?
The small bowl is on the right. The R in the model number identifies the small-bowl orientation, and the bottom grids included in the kit are fitted to each bowl individually.
What countertop materials work with this undermount sink?
The U Series is suited to quartz, granite, and solid surface countertops where undermount installation is standard. Laminate countertops are not a typical match for conventional undermount mounting, as the cut edge requires a finished overhang to stay stable.
Is a template included for cutting the countertop?
The kit does not include a paper template. Have the actual sink on hand before the countertop is cut, and confirm the cutout dimensions with your fabricator, as Karran states its spec-sheet dimensions are accurate to 1/4 inch rather than exact machined values.
Do I need to purchase a drain separately?
The kit includes stainless steel basket strainers for both bowls, which serve as the drain components for each basin. Standard sink drain plumbing connects to these strainers. No additional drain purchase is required for the bowls themselves.
What is Luster Pro oil and what is it used for?
Luster Pro is Karran's care product for stainless steel sinks. A light application after installation helps condition the bowl surface and provides a baseline of protection. It is included in the kit so first-use care is covered without a separate order.
A Kit That Covers the Install from Day One
With the grids, strainers, and care product already in the box, this U Series sink arrives ready for a complete installation, letting cabinet shops and homeowners move straight from the countertop cutout to a finished, working kitchen without a second accessories order.
