I have the mains water fill kit for our Aquaroll and find it works very well.
If its the correct grade hose it shouldn't have any trouble coping with mains water pressure. Ours is fine with the supply tap fully open.
Having seen the previous link, where its using a green hose, "Food Grade" hose should be coloured blue according to a friend that works in the food manufacturing business. Its so it can be easily identified from non food grade hose.
Come to think of it, when my brother built his own house, he laid his own water pipe from the boundary to the house (I helped him with it), and although not a hose, the plastic pipe he used was also blue, which links in to the colour coding being BLUE for water supply pipe.
The kit we have has a blue hose, and the ones sold in our local Caravan dealers are all blue hose too. Have seen Motorhomes using a lay flat hose reel for topping up their storage tanks and that has been blue as well.
If you're buying from ebay, just make sure the hose you receive is infact of FOOD GRADE and not a cheaper alternative!
Chaz
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