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

Product ID: 261481580

Details

Brand
Kohler
Exterior finish
Assorted
Inlet connection size
2 Inches
Item dimensions L x W x H
27.9 x 16.5 x
Material
Metal

🎨Assorted colors for seamless style

🔧OEM engineered for perfect fit

🚽2-inch precision flush valve

Description

🚽 Upgrade your flush game with KOHLER’s flawless fit & finish!

GENUINE KOHLER QUALITY - Maintains original product warranty and longevity with OEM parts
SILENT FLUSH EXPERIENCE - Eliminates annoying running sounds for a peaceful home environment
VERSATILE COMPATIBILITY - Fits Wellworth, Highline, and multiple KOHLER toilet models
PRECISION 2 FLUSH VALVE - Engineered for optimal water flow and reliable performance
QUICK EASY INSTALLATION - Handy-friendly design for a fast, hassle-free upgrade

The KOHLER Genuine Part 85406 2" Toilet Flush Valve Kit is a premium OEM replacement designed to restore and optimize flushing performance in KOHLER toilets like Wellworth and Highline. Featuring a durable 2-inch flush valve, assorted color options, and easy installation, it ensures a quiet, efficient flush while protecting your product warranty.

Specifications

Asin	B001EK2864
Date First Available	21 August 2012
Is Discontinued By Manufacturer	No
Item Model Number	85406
Manufacturer	KOHLER
Product Dimensions	27.94 x 16.51 x 7.62 cm; 245 g

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