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We got a great deal on a sink, but then found out it is an undermount model. Our current one is a drop-in. We would not be able to add the support needed for an under mount. Has anyone installed an under mount sink as a drop in? It is a Kohler (K-5805-2) cast iron, and it's obvious we will have to do something with the larger pre-drilled holes (2 3/8"). Hope you have some advice for us.

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Can you post a photo? – Bryce Dec 12 '13 at 20:41
booklet lists several #s, but believe it to be K-5805-2... What are we going to do with these bigger pre drilled faucet holes? 2 3/8. i was hoping to use this until we do a remodel on the kitchen in a cpl of yrs. May have to store it! – Mark Dec 13 '13 at 0:12
According to the spec sheet the holes are 1 3/8". Do the holes look like they were recut? the porcelain should go into the holes, not stopping clean at the edge – Jack Dec 13 '13 at 2:41

According to your model number it is a Kohler self rimming, surely made for drop in, not undermountenter image description hereenter image description here

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What to do with the bigger holes? You may be able to find a faucet that suits you that will have a big enough bottom to cover your issue. – Jack Dec 13 '13 at 12:29
Or you can get a washer either already with the proper finish, or get one made that will match the finish of the faucet you decide on. It may not be in all cases but Moen seems to have smaller bottoms than Delta, 2 5/16" vs. nearly 2 5/8" on the few that was checked out. – Jack Dec 13 '13 at 12:44

Undermounts are missing a mounting rail and brackets to hold it from shifting.

If you've got 1" or more of counter under the lip of the sink, you can embed it in waterproof adhesive-caulk. It won't be fun to remove, but epoxied undermounts aren't fun to remove either.

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