I have learned many semi-exciting things about toilets over the past two days. I find this rather amusing, as I have installed several toilets in my day and also repaired many of them. But I never knew until yesterday that Kohler manufactures its own fill valve (also known as a ball cock assembly, especially to Elmore and MBarnum), and that, incredibly, no one in Portland carries replacements. I even tried rebuilding the malfunctioning one yesterday to no avail. Isn't it odd that Kohler would not have replacement parts available?