Review on 🚽 Kohler Genuine Part 1083980: 3" Toilet Canister Flush Valve Kit - Reliable and Durable for Efficient Flushing by Mark Bishop

Easy to install if you have a 6 inch wrench. The instructions don't state that the ring that secures the valve in the reservoir from the outside is about 6 inches. in diameter and you need a strap wrench to tighten, I mean tighten. I don't have that big strap wrench, I'm a mechanic, not a plumber. However, I have installed hundreds of Chrysler fuel pumps of the same design. Take a flathead screwdriver and a small hammer and, holding the screwdriver right on the edge of the plastic retaining ring, give it a sharp tap with a hammer. But be careful, the ring is pretty thin and you need to tighten it HERE! Much luck! I would suggest you fill it over the drain gasket above the sink before putting it back on the bowl to make sure it's tight and not leaking.