Product Description Protect the warranty on KOHLER products, always look for the KOHLER GENUINE PARTS logo. KOHLER GENUINE PARTS are designed by KOHLER engineers to maintain original product performance and promote product longevity. This AquaPiston canister allows water to flow into the bowl from all sides (360 degrees), increasing the power and effectiveness of the flush. From the Manufacturer Kohler replacement part; 1188999.Part number 1188999 is a flush valve kit. Flush valve kit No finish Kohler replacement parts.