Check the listing for details. Kohler Genuine 1241991 Canister Valve Assembly. Color: Jersey Cream, Condition: New. Listed at 37.83 USD. The Kohler Genuine 1241991 Canister Valve Assembly is an essential component found in Kohler toilets. Let’s explore its description: Function: The canister valve assembly is responsible for controlling the flow of water from the tank to the bowl during flushing. It ensures proper flushing performance and water conservation. Design and Construction: This assembly typically consists of a durable plastic canister with a rubber seal. The canister is attached to the flush valve tower. The rubber seal creates a watertight connection between the tank and the bowl. Operation: When you press the flush handle, the canister lifts, allowing water to flow from the tank into the bowl. After flushing, the canister drops back down, sealing the opening and stopping the water flow.