Katadyn BeFree Gravity Upgrade Kit - The BeFree Gravity Camp Upgrade Kit turns your Katadyn Gravity Camp or Base Camp Pro into a Katadyn BeFree Gravity Water Filter System. Features 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)