"Watertap" E15 error code indicated leaking. Dried it all out to allow it to run again. Ran dishwasher with front and bottom panels off to get a visual on leak causing the styrofoam float to set off the code. Saw it was coming from the diverter area. Ordered this assembly -- which DOES include the seal ring, by the way -- pulled dishwasher all the way out to replace it, and VOILA. No more leaking or error code. (This took a few days to analyze and receive the part, so in the meantime we were able to run the dishwasher during the day with the door and bottom panel off as long as we monitored the leak and kept some paper towels down there to soak it up.)