Wrenches can make it much easier to open canisters when replacing filters.
Universal industry-sized wrench compatible with most brands, designed for use with industry-sized 10" pre-filter and 1.8" membrane housing canisters
Includes canisters for both the pre-filters and reverse osmosis membrane
It is advised not to close canisters with a wrench as it may cause the O-rings to get pinched. This wrench is specifically designed to open canisters.