This Med4 Elite Air Filter Replacement is a terrific addition to or replacement for the Air Filter that came with the Med4 Control Unit. When needing to replace a worn air filter in the Med4 control unit, this is the filter to be used. This replacement also doubles as a handy spare should the original filter unexpectedly get damaged or worn out quicker than expected. Please note, this is the Air Filter Replacement only. Wraps, control unit and all other Med4 and Game Ready accessories are available separately. Filters should be reviewed on a regular schedule to check for damage, dirt and any areas that may be worn out. Med4 recommends a schedule of every 3 months. To clean the filter, rinse it off with water, shake off the excess moisture and hang it to dry. Once completely dry, place it back in the control unit. With a width of only 1", these Air Filters are near-flat and easy to store. It is advised to unplug the Med4 prior to unscrewing the front cover to replace the filter. It is cautioned to not use any Air Filters on the Med4 control unit other than a Med4 Air Filter. If damage occurs while using a different filter, the warranty may be voided.