Another possibility I just thought of is that it may be food debris from the sink that is causing the blockage, not from the dishwasher. I'm thinking ...

Thank you Mitchell! Yes I did check that, and it seems to have been drilled out to the full diameter of the inside of the barb. The blockage is typica ...

I have a dishwasher with a fairly standard waste pipe, the issue is that where it attaches to the S bend under the kitchen sink there is a "barb?" att ...