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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🚽 Upgrade your flush game with KOHLER’s precision power!

EASY OEM REPLACEMENT - Swap out old or leaky valves with genuine KOHLER parts
WARRANTY SAFE AUTHENTICITY - Protect your KOHLER warranty with certified components
DURABLE MULTI MATERIAL BUILD - Crafted from brass, bronze & stainless steel for longevity
UNIVERSAL KOHLER COMPATIBILITY - Fits Wellworth, Highline & multiple KOHLER models
PRECISION ENGINEERED FLUSH VALVE - Designed by KOHLER engineers for flawless performance

The KOHLER GENUINE PART 85406 is a 2-inch flush valve kit designed to optimize toilet flushing performance for Wellworth, Highline, and other KOHLER models. Featuring a durable mix of brass, bronze, and stainless steel, this OEM replacement kit includes a flush valve, red flapper, triangle gasket, and bolts, ensuring a reliable, warranty-safe upgrade that maintains original product longevity.

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Manufacturer	KOHLER
Part number	85406
Item Weight	245 g
Product Dimensions	27.94 x 16.51 x 7.62 cm; 245 g
Item model number	85406
Size	Single
Color	Assorted Colors
Finish	No Finish
Material	Brass, Bronze, Stainless Steel
Shape	shape
Item Package Quantity	1
Number Of Pieces	1
Specification met	KOHLER
Included components	KOHLER GENUINE PART 85406 2" Toilet Flush Valve Kit
Batteries Included?	No
Batteries Required?	No

KOHLER GENUINE PART 85406 2" Toilet Flush Valve Kit,Assorted Colors

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