Will this lid fit K4436?

Yes, I bought this to replace the lid of my K4436 and it appears to be identical. I would note that this is a white version of the lid since I think K4436 comes in multiple colors.

Is it returnable if it does not fit?

Probably not. I do not see anything on this listing that indicates returns are accepted if the toilet lid does not fit.

Will this fit k-4421 tank ?

I do not know. Mine is a standard size and it would not fit . I had to go a plumbing supply place to get a used one

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🚽 Upgrade your throne with Kohler’s precision-crafted tank cover—because your bathroom deserves the best!

BUILT TO LAST - Crafted from premium vitreous china porcelain for unmatched strength and longevity in your bathroom.
COMPACT SLEEK - Measuring 19.6" x 8", this cover blends perfectly with your bathroom’s modern style without bulk.
EFFORTLESS UPGRADE - Replace your worn-out lid with a modern, clean white cover that elevates your toilet’s aesthetic instantly.
TAILORED TO PERFECTION - Engineered exclusively for Kohler Wellworth tanks 4436, 4437, 4620, 4632 & 5307—no guesswork, just seamless fit.
AUTHENTIC KOHLER QUALITY - Backed by genuine Kohler engineering to maintain original performance and durability you can trust.

This Kohler Genuine Toilet Tank Cover is a precision replacement lid designed specifically for select Wellworth toilet models. Made from durable vitreous china porcelain, it ensures long-lasting performance and a perfect fit. Measuring 19.6" by 8", it offers a sleek, modern look that enhances your bathroom’s style while maintaining Kohler’s trusted quality standards.

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Smooth transaction and product arrived in perfect condition.

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Color	White
Brand	KOHLER
Material	Vitreous china procelain
Style	Modern
Product Dimensions	19.6"L x 8"W
Item Weight	11.5 Pounds
Operation Mode	Manual
UPC	040688964157
Global Trade Identification Number	00040688964157
Manufacturer	Kohler
Part Number	84591-0
Item Weight	11.5 pounds
Item model number	K-84591-0
Is Discontinued By Manufacturer	No
Size	19.6 x 8 x 1.5 inches
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

Toilet Tank Cover

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