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Connect a GravityWorks water filter (and most other water filters) directly to a Big Zip EVO Reservoir without ever having to take it out of the pack with the Platypus Big Zip EVO Hydration System Water Filter Connector Kit. Just plug the hose into the base of the filter, insert the quick-disconnect fitting into the upper port on the reservoir, and filter and fill without ever taking the reservoir out of the pack. Let gravity do the rest and be on the way with clean, taste-free water. Made in the USA.