Has anyone had issues with the white refill tube coming out of the canister?

Yes. Tube had hardened after 8 years of use. When replaced tubing, I found the 1059289 Canister Flush Valve Stop Kit (the plastic piece to which the tubing attaches) had cracked, no longer able to twist lock. I will either replace it (original black plastic piece is discontinued - 'appears' to be replaced by flush-valve-repair-kit-1229656 with larger yellow plastic piece) or drill a hole and insert a pin to hold it in place. The teflon tape idea or some 'reversibly' applied rubber cement, might be needed to hold tubing in the valve stop item.

how do I install kohler 1083980?

In a nutshell, the lower two components in the image go under the tank and everything else goes inside. If you can't use the installation being replaced as a guide for installing the new one, this site (http://www.plumbingsupply.com/kohlertoiletparts-cimarron.html) also kind of helps visualize how it all fits together with the tank plate.

where do i find toilet model number/

On back of toilet tank- you will have to remove it to see it

Will this flush valve fit the 1.6 Gal model?

I replaced the flapper (old style) Kohler pn:1024385 with this canister upgrade and while it does work, my wife & I both agreed that old style provides stronger flushing, don't recommend if you want to retain original powerful flushing. Nowhere in documents do I find if this new style was to try conserving water, but suspect it might be part of new design.

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Description

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

TAILORED FOR CIMARRON - Specifically designed for Kohler Cimarron tank model K-4634 for a perfect fit.
HASSLE FREE REPLACEMENT - Lightweight (3.2 oz) and easy to install, so you’re back to flawless flushing in no time.
DURABLE LOW MAINTENANCE - High-quality plastic construction resists wear and simplifies cleaning—no abrasives needed.
GUARANTEED KOHLER QUALITY - Genuine OEM part ensures seamless compatibility and maintains your toilet’s warranty.
PRECISION ENGINEERED FLUSH POWER - 3-inch canister and outlet deliver a robust, efficient flush every time.

The Kohler Genuine Part 1083980 is a 3-inch canister flush valve kit designed exclusively for Kohler Cimarron toilets (model K-4634). Crafted from durable plastic and engineered by Kohler, it guarantees OEM-level performance, easy installation, and maintains your toilet’s original warranty. Lightweight and built to last, this flush valve kit ensures a powerful, reliable flush while protecting your investment.

Specifications

Material	Plastic
Brand	Kohler
Item dimensions L x W x H	10.8 x 3.5 x 3.5 inches
Exterior Finish	Plastic
Inlet Connection Size	3 Inches
Inlet Connection Type	Barb
Outlet Connection Type	Barb
Number of Ports	2
Outlet Connection Size	3 Inches
Global Trade Identification Number	00650531618245
Manufacturer	Kohler
UPC	650531618245
Part Number	1083980
Item Weight	3.2 ounces
Product Dimensions	10.8 x 3.5 x 3.5 inches
Item model number	1083980
Is Discontinued By Manufacturer	No
Size	10.8 x 3.5 x 3.5 inches
Color	Black
Style	Kit
Finish	No Finish
Item Package Quantity	1
Included Components	flush valve
Batteries Included?	No
Batteries Required?	No
Warranty Description	One-Year Limited Warranty

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