Try towsure, in the catalogue p.118 it shows a clear fresh water inlet hose half inch diameter used for connecting water barrel and caravan - it doesn't say its an aquaroll though.
David, I bought a 15m flat reel of food grade hose from a company called something like Riverleisure over the net, it came with several adaptors but I had to fiddle around with odd tap connectors to adapt it to fit my aquaroll. Cost was around
Facebook
Twitter