Even as a Kohler dealer, finding that kind of (important detail you might want to know), has always been tough. The product is fine, the people at the factory are usually friendly and helpful, but this kind of stuff should be easily available without digging or having to make a call. The new dealer website, I can't find anything, not just this info. The company you are buying from needs to call and get you this from the factory. I know I would. How else are you going to size the conduits other that make the best guess?
The other thing is, most manufacturers aren't going to give out much info to non dealers, this isn't unique to Kohler.
The other thing is, most manufacturers aren't going to give out much info to non dealers, this isn't unique to Kohler.