is the toilet tank lined?
The Kohler K-3818 tank does not have an insulated liner in it.

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*Denotes a finish or option that has been discontinued
The Kohler K-3818 tank does not have an insulated liner in it.
No, the seat does not come included. You will need the K-4650 or the K-4636.
The Kohler K-3818 is compatible with the K-4733 soft close seat. Siphon jet is a more powerful flushing system so it will keep bowls cleaner while being louder at the same time.
The Kohler K-3818 and the K-3819 have slightly different designs to them. If you look at the two tank lids you can see a difference.
| Rough In | 12 |
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| Sub Category | Two Piece Elongated |
| Concealed Trapway | No |
| Made in America | Yes |
| Flush Type | Siphon Jet |
| Height | 31.4375 |
| Trip Lever Placement | Left |
| WaterSense Certified | No |
| Product Weight | 105 |
| Trapway | 2.125 |
| Theme | Traditional / Classic |
| ADA | Yes |
| Bowl Height | 16.5 |
| Width | 17.8125 |
| Category | Toilets |
| Material | Vitreous China |
| Configuration | Two Piece |
| Country Of Origin | USA |
| Gallons Per Flush | 1.6 |
| Depth | 30.375 |
| Length | 30.375 |
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