MSR Guardian Prefilter Replacement

The MSR Guardian Filter is the most advanced filter on the market, but it won't work if it's clogged full of sticks, leaves, and dirt. The Guardian Prefilter Replacement Unit keeps larger debris from getting sucked up the intake hose and jammed into the filter, so you can keep the Guardian working efficiently for its full 10,000 liter life without needing to replace the hollow fiber filter.