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  • Hydrapak Ultraflask Filter Cap

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    Run fast, filter faster. The UltraFlask+ Filter Cap threads seamless onto all of HydraPak’s 42mm running flasks and handhelds for a lightweight, straightforward filtration solution. Featuring a traditional bite valve and cap design, runners can drink freshly filtered water directly through the high-flow Blaster valve.

    • The integrated filter removes Escherichia coli bacteria, Cryptosporidium parvum cysts, and Giardia Lamblia from approximately 1,500 liters of water at a rate of >1L per minute.*
    • Minimal design and lightweight materials make this filter the ideal choice for runners. It takes up no extra space when stored or threaded directly onto a flask.
    • Easy to drink bite valve auto-seals after each sip, eliminating annoying drips.
    • Easily thread the filter onto some of the most popular running softflasks, flexible bottles and water storage containers.
    • Plugs into filter valve and threads onto a HydraPak Stow or bottle of clean water for backflushing the filter to restore its flow rate.
    • Weight: 36 g / 1.3 oz
    • Dimensions: 42mm
    • Material: ABS, POM, Silicone, Hollow Fiber
    • Care: Avoid freezing filter. Freezing may ruin the hollow fiber membrane. If in freezing conditions we recommend you keep the filter in your pocket or near your body to prevent freezing.