The Kohler Riverby single-bowl sink is a cast-iron undermount model with a 33-inch class footprint and four pre-drilled faucet holes. Its white enameled finish and wide basin are geared toward kitchens that want a traditional material with a generous single-bowl layout. The four-hole configuration makes it easier to support a faucet plus added deck accessories without custom drilling.
What mount type does the Riverby use, and how should the countertop cutout be handled?
This Riverby model is an undermount sink, so it installs below the countertop and requires a matching undermount cutout. The countertop fabricator should use Kohler's template and confirm the desired reveal before making the final opening. Because the sink is cast iron, the cabinet and support method should also be checked during planning. A correct cutout and stable support are both important for a clean finished installation.
How durable is the cast-iron sink body?
Cast iron is a durable and rigid material that gives the sink a substantial feel and strong resistance to everyday wear. Kohler's enameled finish is designed for kitchen use, though severe impacts can still chip the surface if heavy cookware is dropped hard enough. The weight of the sink is part of what makes it feel solid, but it also means proper support is required. With normal care, cast-iron sinks are known for long service life.
What are the drain and faucet hole details on this model?
This version includes four pre-drilled faucet holes, which supports a deck-mounted faucet plus additional accessories such as a side spray, soap dispenser, or air switch depending on the setup. The exact drain location is not provided in the source details used for this entry, so it should be verified from Kohler's specifications before rough-in. That is most helpful when matching the sink to an existing drain or disposer position. The four-hole layout is the clearest differentiator in this specific Riverby configuration.
What accessories come with the Riverby sink?
This listing is for the sink only. No faucet, drain assembly, sink rack, or other accessory bundle is specified as included here. Buyers should plan those components separately unless another listing explicitly includes them. The product focus is the cast-iron basin and four-hole deck configuration.
How should the sink be cleaned and maintained?
Clean the sink with a soft sponge or cloth and a mild non-abrasive cleaner. Avoid steel wool, abrasive pads, and harsh powders that can damage or dull the enameled finish over time. Rinsing after use helps reduce residue and staining, especially in a white basin. If heavy cookware is used often, a rack can help minimize direct wear on the sink surface.
# Kohler Riverby Single-Bowl Kitchen Sink **Model:** `K-8689-4U-0` **Brand:** Kohler **Category:** Kitchen Sink > The Kohler Riverby single-bowl sink is a cast-iron undermount model with a 33-inch class footprint and four pre-drilled faucet holes. Its white enameled finish and wide basin are geared toward kitchens that want a traditional material with a generous single-bowl layout. The four-hole configuration makes it easier to support a faucet plus added deck accessories without custom drilling. ## Specifications | Attribute | Value | |---|---| | Sink Type | undermount | | Material | cast-iron | | Bowls | 1 | | Overall Dimensions In | 33 x 22 | | Faucet Holes | 4 | | Sound Dampening | No | | Color Finish | White | | Warranty | Limited Lifetime | ## What's Included - Sink only Source: https://www.jaspecs.com/kohler/kitchen-sink/k-8689-4u-0-kohler-riverby-single-bowl-kitchen-sink/