You are certainly correct on all accounts. The flat blue vinyl emergency drain hose would only work well on the output of a clothes washing machine stationed on someone's country back porch!
So what I've finally wound up doing on the advice of a plumber and a mobil home repair parts person is working with the original stiff plastic pipe but replacing the hose end connectors with threaded rings and new plastic ferrules. The old one-piece nut and ferrule set up just couldn't be tightened enough to hold.
I also placed an extension on the sink drain in order to give the drain pipe a slightly greater length.
I'll post back when done.
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