Access potable water anywhere. Convert your reservoir or water bottle into a water filter. The 28mm inline filter sets a new standard for lightweight, fast and versatile backcountry water filtration. Compatible with all HydraPak 28mm opening bottles and flasks, as well as Plug-N-Play connectors used on reservoirs and water storage containers. Filter Kit includes: Inline Filter Cap Adapter - Plugs into filter outlet allowing user to thread on their Stow or Smart Water™ Bottle cap. Backflush adapter - Plugs into filter outlet and threads onto a HydraPak Stow or bottle of clean water for backflushing the filter in order to restore its flow rate. Product use and care instructions *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 Weights and Dims Diameter: 34 mm / 1.3 in Weight: 47 g / 1.6 oz (filter only) Length: 129 mm / 5.1 in