The Wellbox filter cap holds the filter in place. The filter cap must be completely sealed in order for the suction of the Wellbox to work properly. To remove the filter, unscrew the cap by turning to the left and pull it out. Remove the used filter and detach from the cap. Mount the new filter by turning down the two lock pins and set the cap back into place. If you have any questions please call us at (701)223-9936 or Toll Free (800)355-2956.
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