Katadyn BeFree Gravity Camp Water Filter Upgrade Kit. Adapter Ring (Female thread attaches to Katadyn Gravity Camp 6L or Katadyn Base Camp Pro 10L water bag / male thread for use with a Katadyn BeFree filter element). Integrated hose suspension to attach the outlet hose to the Adapter Ring. Quick-release valve with automatic outlet stop (Female thread attaches to Katadyn BeFree replacement filter / quick-release fastener for quick-connect coupling) The Upgrade Kit requires a BeFree filter element (sold separately) and an existing 6L or 10L water filter system with accessories. Package Contents: Katadyn BeFree Gravity Camp Upgrade Kit Katadyn 8020861: BeFree Gravity Camp Water Filter Upgrade Kit