Looks like those all say they're for use with air and explains that it shouldn't be used for water or in humid environments because they're ester based. Did you actually use them and they're fine?
Yeah, I've been using the Tygon hose for all my fuel lines for more than a decade now. I know several other people who have as well. The Tygon works extremely well.
Thanks for your help, I'll make one at 600mm and see if it works for him.
Many thanks.
other part number for the whole thing
13754014256