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Your cart is empty. Perfect Fit for Kohler Toilets: Our flush valve seal seamlessly replaces the Kohler K-GP1059291. Designed for all Kohler toilets with canister flush valves, it stops leaks and ghost flushes. With an 85mm outer and 66mm inner diameter, it ensures a snug fit, instantly restoring performance. Save water and enjoy reliable flushes every time!
Innovative Triple-Lip Design: Our Kohler flush valve seal features a three-lip design for easy installation and removal from any angle. This unique feature simplifies replacing old seals, saving time and frustration. Ideal for both DIY novices and pros, it ensures a leak-proof fit that keeps your toilet running smoothly.
Premium Silicone Durability: Crafted from high-quality silicone, our flush valve seal resists chlorine and harsh chemicals better than rubber seals. At 1.5mm thick, it offers long-term wear resistance. Its flexibility ensures a tight fit, fixing leaks and reducing water bills, making it an eco-friendly, cost-effective choice for households.
Quick and Easy Installation: Fix your Kohler toilet in minutes with our flush valve seal. No disassembly needed—remove the valve stem, wipe off the old seal, secure the new 1.5mm thick seal around the tank lip, and test. A hassle-free solution that stops leaks and saves on plumber costs!
Package Contents: This pack includes two Flush Valve Seal for Kohler, a reliable GP1059291 replacement designed to stop leaks and restore flush performance. It ensures lasting functionality for your Kohler toilet.
DRN
Reviewed in the United States on May 25, 2025
I needed a new flush valve seal for my Kohler toilet, which takes a GP1059291 gasket. The short review is that this gasket is a bit smaller than the original gasket, but did stretch to fit and after a couple days of use seems to be functioning perfectly.This is advertised as being a "perfect fit" replacement. The inner diameter of this gasket is 66mm (as advertised), but the original gasket I removed was closer to 70mm. It was a bit difficult to get an accurate measurement on the old gasket, and there is no way for me to know if it had stretched over time. This new gasket had to be stretched to fit and seems like it should have been at least a couple of millimeters larger. However, it was relatively easy to install and seems to be sealing just fine.I removed one star because I don't feel it's a "perfect fit" replacement. However, it's definitely cheaper than the manufacturer brand, seems to be working just fine, and is easy to install. It seems like most off-brand replacements are this size, so it's not a knock on this particular gasket. Perhaps it's even the "correct" size and my old gasket was merely stretched.I have no trouble recommending this as a suitable GP1059291 replacement, and will come back and upgrade my rating if it continues to function well and has a good service life. I hope this review was helpful.
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