4 pack of filters. Includes 4 o'rings and 4 " of silicone tubing. Filters are use in units with a storage tank cup #505.
A small cartridge containing activated carbon designed to fit snugly into the post-filter cup in the Midi-D series and Aqua-D series storage tank, or any other Pure Water brand distiller that has the stainless steel cup recessed in the storage tank. Filter Dimensions = 1-3/4 " x 1-3/4 "