Is the diameter of the flush valve 2"?

not sure about diameter of large tube that goes between tank and bowl. Seems larger than 2". Cant really measure since installed. Here is link to picture https://www.plumbingsupply.com/images/kohler-flush-valve-85406.jpg . THis is the only one that fits Kohler Highline toilets and worth the price. Key Is triangular gasket at bottom that only comes with Kolher

will this fit a 4609 model toilet?

Yes, but if your ballcock is not adjustable style water will over flow the tube. If it is adjustable just change water level to the mark on the tube, or about 3/4 inch below the top of the tube. This item fits most all Kohler tanks with the three bolt configuration.

I installed this but still have a slow leak from tank into the bowl. Is the flapper opening the only place water can flow from tank to bowl?

make sure you have the nut tight enough or not over tigthen. Make sure the flapper is coming all the down to seal. Make sure you don't have a cracks .

Do I have to buy the fill valve too?

If you're already buying the flush valve and the three bolt tank seal, you might as well replace the fill valve also. Replacing those three items will make the toilet like new for many years.

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Description

🚽 Upgrade your flush game with Kohler’s precision-engineered valve kit!

COMPLETE FLUSH KIT - Includes 2" flush valve, red flapper, triangle gasket, and bolts—everything you need in one package.
WARRANTY SAFE UPGRADE - Protect your Kohler product warranty by using genuine Kohler parts built to exact specifications.
SEAMLESS OEM REPLACEMENT - Directly replaces part #84246 and fits Wellworth, Highline, and other Kohler toilets for hassle-free installation.
UNIVERSAL FIT WITH STYLE - Assorted colors add a subtle touch of customization while maintaining flawless function.
PRECISION ENGINEERED FLUSH VALVE - Designed by Kohler engineers to optimize flushing performance and ensure long-lasting reliability.

The Kohler Part 85406 2" Toilet Flush Valve Kit is a genuine OEM replacement designed to restore and optimize flushing performance in Wellworth, Highline, and other Kohler toilets. This all-in-one kit includes a 2-inch flush valve, red flapper, triangle gasket, and bolts, ensuring a perfect fit and long-lasting reliability while protecting your product warranty.

Specifications

Brand	KOHLER
Item dimensions L x W x H	11 x 6.5 x 3 inches
Exterior Finish	Assorted Colors
Inlet Connection Size	2 Inches
Inlet Connection Type	Barb
Outlet Connection Type	Barb
Number of Ports	2
Outlet Connection Size	2 Inches
Global Trade Identification Number	00040688884073
Manufacturer	Kohler
UPC	040688884073
Part Number	85406
Item Weight	8.6 ounces
Product Dimensions	11 x 6.5 x 3 inches
Item model number	85406
Is Discontinued By Manufacturer	No
Size	Single
Color	Colors may vary
Finish	No Finish
Shape	shape
Item Package Quantity	1
Number Of Pieces	1
Included Components	KOHLER GENUINE PART 85406 2" Toilet Flush Valve Kit
Batteries Included?	No
Batteries Required?	No
Warranty Description	Warranty

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