The Nexus 320 Filter Lid is vey light weight and very durable and UV resistant. They fit perfectly on top of the Nexus Eazy 220 & Nexus Eazy 320 systems.
 
The lids are very well made, robust and of course will with-stand the outside weather conditions as well, but more importantly it will keep out light as well as debris which will effect the Bio mass inside the Nexus Eazy 220 Filters.
 
Simply a must when buying the Nexus Eazy 220 or Nexus Eazy 320 filters.