No. The nut currently screwed to the sink waste ,screws to the thread on the bottom of new fitting.And the nut on the top of the new fitting screws to the sink waste.
Terry. You'll never believe it. After all that fuss I found this in the cupboard next to where the new dishwasher would go. Can you tell me what waste hose would fit this standpipe? I'm guessing that's what the standpipe is for.