HydraPak 42mm Water Filter Cap

£33.95


Free Delivery: Available on all orders over £50.

Next-Day Delivery: Available for orders placed before 3 PM with DPD (additional charges apply).

Free DPD Upgrade: Orders over £250 qualify for a complimentary DPD upgrade.

Secure Checkout: Includes theft protection for added peace of mind.

Refunds & Exchanges: Contact us within 30 days for hassle-free returns or exchanges.


Filter water on the go. The new 42mm Filter Cap threads seamlessly onto all sizes of HydraPak’s 42mm threaded Seeker water storage bags and Flux flexible bottles morphing them into filtration solutions.

The end result being lightweight filtration kits that can either be used to squeeze filtered potable water into other camp bottles and containers or to drink freshly filtered water from a Seeker or Flux. Both deliver fast and easy water treatment around camp or on the go.

  • LIGHT & COMPACT

    At only 57 grams, our filter is one of the lightest filter options available. Its small size takes up no extra space when stored or threaded directly onto a Seeker or Flux.

  • DUST COVER & HIGH-FLOW NOZZLE

    Keeps dust off your drink nozzle. Quickly opens and closes the drink nozzle with one hand without any direct contact with dirty hands.

  • 42MM THREAD COMPATIBLE

    Easily thread the filter onto some of the most popular backpacking water storage bags and flexible bottles including the HydraPak Seeker 2L, 3L, 4L, and 6L and 1L and the Flux 750ML, 1L, and 1.5L

  • FAST & SAFE FILTRATION

    Removes 99.99% of E Coli & Parasitic cysts. Filters approximately 1,500 litres of fresh water at a rate of >1 L per minute.

  • SAFE

    Filter removes Escherichia coli bacteria, Cryptosporidium parvum cysts, and Giardia Lamblia (99.9%) from approximately 1,500 litres of water.

  • SAFE & RELIABLE

    100% BPA and PVC Free

  • Features

    Effectively removes common waterborne bacteria, such as E. coli (99.9999%), and parasitic cysts (99.999%) per EPA Guide Standards and NSF P231 and microplastics (99.999%) per NSF 42 greater than or equal to 3.0 microns in size.

    EPA COMPANY NO.:102123 EPA ESTABLISHMENT NO.: 102123°CHN°1

    Single stage < .2 micron hollow fibre filter

    Effective against: protozoa, cysts, and bacteria

    Meets or exceeds EPA protocol

    Filters at >1L/minute

    Filter life approx. 1500L

  • Specifications

    DIAMETER
    42 mm

    WEIGHT
    57 g

    MATERIALS
    PP/POM, EPDM, Silicone, Hollow Fibre

Valley and Peak Promise

"The Valley and Peak promise is built on three pillars: thoughtfully curated gear, exceptional customer service, and a genuine love for the outdoors. As an independent, family-run business, we carefully select products from a wide variety of cottage gear brands and trusted names, ensuring that each item is rigorously tested and loved by our team. Our customer service is a cornerstone of our brand, offering personalised support to help you choose and care for your gear with confidence"

Jim De'Ath, Managing Director