I received the 1-1/4 x3/4 spud and of course it was too large to fit through the porcelain inlet opening but the rubber seemed to fit like a glove. I then did what was suggested earlier in this thread and ground it down to fit, I used a grinder not a file as it was a lot of material to remove. There isn't much material left at the tapered end but it's tight now, rock solid and leak free. Thinking about ordering a kohler 18376 or maybe a 18377 with flow control and then cut the shaft off. 18377 appears that it may be a slightly larger diameter at bell. Has anybody here installed the 18377? I need to fix the 2nd urinal and have a couple ready to go spares on the shelf. Seems crazy to me that I can't seem to find a direct fit easily and very little info on the actual spud dimensions available.
