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[Shop-talk] Sealing toilet tank mounting bolts?

To: Shop Talk <shop-talk@autox.team.net>
Subject: [Shop-talk] Sealing toilet tank mounting bolts?
From: Jim Franklin <jamesf@groupwbench.org>
Date: Thu, 21 Nov 2024 08:16:54 -0500
Delivered-to: mharc@autox.team.net
Delivered-to: shop-talk@autox.team.net
I bought 3 Kohler Cimarron toilets for a job I'm doing, because the one in my 
house is great. Well, the new ones are very different and I should have read 
all the reviews on the Home Depot site.

The tank-to-bowl connection is made with 2 bolts that pass through grommets. 
These grommets expand as the bolts are tightened, sealing the holes in the tank 
through which they pass. Problem is, quality control let some tanks through 
with holes oversize enough that the grommets won't seal. Kohler even sent me a 
new supposedly redesigned grommet kit, which slowed down the leaks to a drip 
once per minute. They said they'd send a new tank but can't expedite it, so 
we're looking at after Thanksgiving, and no guarantee that the new tank won't 
also be mismanufactured.

My thought is to use a sealant on the grommets. Kohler said "we don't advise 
that", but I really need to wrap this up. Is there a rubber-compatible, 
submergeable sealant that will work in this application?

Another thought I just had is to add washers on top of the bowl where the 
bottom of the grommets sit so that the grommets are compressed another 1/16". 
But I don't want the grommets to then start leaking on the inside along the 
bolt if I overcompress and they open up. 

There are images near the bottom of this page:

https://www.faucet.com/kohler-k-31615-white-cimarron-1-28-gpf-toilet-tank-only-left-hand-lever/f4091621#reviews

thanks,
jim
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