After using my hydration system for many years the helix tube was starting to leak. I was very happy I could replace it without having to purchase a whole new system. It fit perfectly and I am perfectly happy with it.
Purchased to replace a chewed up bite valve on ski touring pack. I really like source bladders - they are truly taste-free. The tubing,, however, imparted a chemical taste for the first ~5 times I used it, but it's all good now. I enjoy the quick connect feature so I can leave the tube in place when I fill the bladder, be it in my bike pack or my ski pack. I also enjoy the twist to lock the valve closed. I'm a Source believer.