FYI, I just had an order of Rena Filstar 5/8" tubing come back and it turns out that there are two 4.5ft long hoses per unit ordered. I thought I was just getting one, but two is the norm. I'm guessing this is a normal occurance b/c they where in a bag sealed by Rena. These would work well as a replacement for other canisters (Magnum 350s use 5/8") or as return tubing. I like the flexibility of Rena tubing.