Installation Guide
Undercounter Cast Iron Sinks

Before You Begin (cont.)

A cabinet with a minimum width of 36² (91.4 cm) is recommended for this installation. Smaller cabinets are not recommended, as they may require structural modifications to work with this installation.

All information in these instructions is based on the latest product information available at the time of publication. Kohler Co. reserves the right to make changes at any time without notice.

1. Prepare the Site

CAUTION: Risk of personal injury or product damage. Do not support the sink by the sink rim. The support framing, not the rim, should withstand the entire weight of the sink when it is full of water.

IMPORTANT! Inspect the flooring at the installation site. Repair as necessary.

IMPORTANT! Make sure there is adequate plywood support if the floor is constructed of wood.

NOTE: You may require different or more specialized tools to install this sink to countertop materials other than wood or wood composites.

Measure the thickness of the countertop.

Determine the threaded shank length of the faucet.

Measure to verify that the faucet will fit on the countertop as required. If the faucet will not fit, you will need to select a different faucet or countertop.

2. Install the Optional Undermounter Kit

NOTE: This cast iron sink requires either an undermounter kit or support framing. Undermounter kit installation is covered in this section. Support framing is covered in the ²Install the Support Frame² section.

IMPORTANT! Installing a support frame is required for K-6498 and K-6499 models, and is an installation option for all other models. If applicable, proceed to the ²Install the Support Frame² section.

Determine the front-to-back length of the inside of the cabinet.

If necessary, cut the rails so they fit snugly with the cabinet walls. Rails may be up to 1/8² (3 mm) shorter than the determined length of the inside of the cabinet.

Thread the bolts into the nuts two turns, and then slide the nuts into the slot in the rails. Slide the nut and bolt into the desired position in the slots located on the rails. Adjusting bolts should be located in the outermost slots that will be under the corners of the sink.

With a tape measure, determine the overall width of your sink. This distance represents the distance (A) between the outside edges of the rails, as shown in the schematic above.

Using a hanger bracket as a template, mark the screw placement on the cabinet, according to the measured width of your sink.

Drill 1/8² (3 mm) starter holes at the marks.

Proceed to the ²Install the Sink² section.

3. Install the Optional Support Frame

CAUTION: Risk of personal injury or product damage. The wood support and frame for the sink must support a minimum of 300 lbs (136 kg). This is the approximate weight of the cast iron sink when full and with a garbage disposal installed.

Measure the cabinet opening where the sink will be installed. Plan for adequate clearance between the faucet handles and the countertop backsplash or finished wall.

Construct a wood frame for the inside of the cabinet. Allow adequate clearance for the faucet assemblies and sink basin. Ensure that the frame will support the entire sink rim.

NOTE: Use proper fasteners and techniques to ensure that the frame will support a minimum of 300 lbs (136 kg). Place the fasteners for easy access in case the sink should ever need to be removed.

Secure the wood frame inside the cabinet with fasteners. The top of the sink rim must be flush with the top surface of the countertop underlayment or backing material.

Locate the fasteners for easy access in the event the sink needs to be removed.

Apply a 1² (2.5 cm) bead of silicone sealant at each corner of the wood frame where it will contact the sink.

4. Install the Sink

CAUTION: Risk of personal injury or product damage. Cast iron sinks are very heavy. Get help when lifting the sink into place. Wear safety shoes and glasses.

Carefully position the sink within the wood frame. Make sure that the sink is centered in the cabinet.

Verify that the sink is level. The top of the sink should be flush with the top of the cabinet to allow proper countertop installation.

Adjust or shim between the sink and support if needed. If shimming is necessary, apply.