Installing my dishwasher

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Again, "Did you notice the cabinet entry point of all the examples in the link I sent you?"

It's in post #49.

They enter at the floor of the sink cabinet, not the top, then are looped, in an adroit loop, before attaching to the sink drain.

That adroit loop is the siphon break and prevents backflow.

That is different from what was said in another post that told me to drill at the top of the cabinet.

I think it serves the same purpose, though.

How do I secure the tube to the top of the cabinet?

I shouldn't have said "too lazy," maybe "too busy."
 
Which was much later in the thred.

Only in part because in the 1st photo of post #53 shows an almost horizontal section of discharge hose instead of an adroit loop, so all the discharge in that section of hose will siphon back into the DW. What you are experiencing.

The discharge hose is attached with either vinyl or metal plumbers tape, 1 or 2 hole straps and short screws.
 

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