Fits into Plug-N-Play Caps and Connectors to create a direct connection between your 28mm backcountry water filter and HydraPak Seeker storage containers, Flux bottles and reservoirs.
Compatible with most 28mm threaded water filters.
Must be paired with a HydraPak Plug-N-Play connection in order to work. 
Example image pairs Sawyer Filter with the Filter Adapter and the Plug-N-Play cap.