Klean Kanteen H2O Filter Adapters are designed for the Classic Stainless Steel Water Bottles. Used with most standard water filters, these adapters help remove particles and other impurities from water from a river or stream so you can always enjoy crisp, clean water.

One end of the filter screws into the classic bottle and the other end has a universal thread design to most standard backcounty water filters.

Interchangeable between all Klean Kanteen classic bottle sizes.