The Aquabrew Water Filtration System consists of a mounting bracket and a filter. The bracket mounts on the back of your Aquabrew plumbed drip coffee maker. If you purchased a starter set with water filter option, you already have this installed. If you purchased your machine without the option installed, this is the kit you need. Replacement filters are also available (must already have this kit). Recommended for plumbed Aquabrew commercial coffee makers.