Deck Drain Hose

Yes, that is correct.
But the rubber hoses with ferrous spiral inside are for fuel use or things they can come in contact with fuel and oils..

What I don't know is what kind of hoses are for deck drains and they are not below waterline, well usually not.
Should you have a link or know were to find that informations it would be interesting to see if something better than the discussed rubber hoses is allowed.

Chris
Try searching at Wholesale Marine.

 
The factory ones have lasted 16 years now. No signs of dry rot. I say to each their own, but I do like the wall thickness of them.