I can provide general information based on what was available up to that point.
Kohler, a well-known manufacturer of kitchen and bathroom fixtures, typically offers warranties on its products, including kitchen sink drains. The specific terms and duration of the warranty may vary depending on the product model and the region in which it is sold.
If you are interested in purchasing a Kohler kitchen sink drain or any other product, I recommend visiting their official website or contacting their customer service directly to inquire about their current warranty policy and coverage details. Alternatively, you can also check with authorized Kohler dealers or retailers for information on the warranty provided with their products.