What @tbone1004 is telling you above is that, no - the Atomic Comfort Swivel hose will not fit on an XStream Second. The thread connection for the comfort swivel is a direct thread-on to a standard barrel, and requires more thread length than the Jetstream valve has, even if it matched.
The good news is that you can get a reasonably good price for the hose on eBay. It'll almost cover the Omni-Swivel cost.
The good news is that you can get a reasonably good price for the hose on eBay. It'll almost cover the Omni-Swivel cost.