Is the length measurement from the to the front edge of the bowl or is it the base measurement?
The Kohler K-3888 is 27.25" over all in length. This is measured from the back of the tank to the front ledge of the bowl. You can open the Specification Sheet and it shows all the measurements of the toilet.
What toilet seat do I need with this toilet? Kohler K-3888-0
The Kohler K-3888 will work with any of Kohler's round seats, like the Kohler K-4639.
What is the size of the flush value for this model?
This comes with a class 5 siphon jet flush. It uses 1.6 gallons per flush.
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