Nexus Automatic System for Gravity Set Up (220 Body)Nexus Automatic System for Gravity Set Up (220 Body) Description The hassle free way to clean Nexus filtration systems. Automates the cleaning process of the Nexus Easily fits onto Nexus filters (post 2006 models) Control box automatically operates valves and pumps Adjustable timer controls the frequency of the cycle Easy to set up for multiple cleaning cycles Manual cycle can be carried out at touch of a button Gravity fed and pump fed versions