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Kohler 1112258 Tank Plate

Black plastic tank plate with mounting slots.
Kohler 1112258 Tank Plate - Image 2

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“Just before an event, we had a 9 7/8" round drain cover snap in half. It was an odd size and Noel's was the only place that seemed to have one that would fit. We couldn't leave the hole exposed during the event, and Noel's was kind enough to make sure it was overnighted to us. Their effort was truly appreciated and the cover fit perfectly! I highly recommend them! ”
-Linda C.
03/27/2026

$18.47

 

The Kohler 1112258 is a genuine Kohler part designed to be used between the toilet tank and bowl, specifically for models like the Kohler 4166.

We can ship anywhere the US Postal Service ships. For orders being shipped outside the US, please contact us at (888) ASK-NOEL, noelsplumbingsupply@fuse.net, or via the text widget on this screen.

SKU: 12866A Category: Tag:

Kohler 1112258 Toilet Tank Plate is a genuine OEM replacement component designed to fit securely between the toilet tank and the bowl. It serves as a structural reinforcement layer specifically engineered for Kohler toilet tank model 4166, replacing the legacy part number 1083108.

 

1112258

 

  • Serves as a mounting or stabilizer plate positioned underneath the tank to ensure a sturdy, leak-free connection to the bowl.
  • This part number (1112258) replaces the older part number (1083108).
  • Engineered to promote product longevity
  • Made with premium materials for enhanced durability

 

Common questions about this product

Is this item the original manufacturer's recommended replacement part? chevron-icon

Yes, this is the OEM recommended part.

Is this the correct item for my application? chevron-icon

If you’re not sure text us a picture 1-888-275-6635 or email us a picture at noelsplumbingsupply@fuse.net.

 

We will make sure you have the right part.

 

 

chat iconWHAT OUR CUSTOMERS SAY…

“Love Noel's Plumbing Supply! They are one of my favorite oddball plumbing parts purveyors. As a professional plumber, I rely on sites like Noel's to keep antique and rare fixtures alive. My customers and I are so grateful! ”
-Danielle E.
03/25/2026