10 x 4.5 Refillable Filter ECC-10BB-WF

http://www.waterfilters.net/WaterFiltersNET-ECC-10BB-WF-Empty-Big-Blue-Filter-Cartridges.html
The ECC-10BB-WF empty refillable water filter cartridge measures 4.5" OD X 9.75" L.
It is a clear empty cartridge that allows you to see when you need to replenish the media in the cartridge. This is a refillable empty cartridge that you can fill and refill with the media of your choice.