An extra bottle adapter for the Katadyn Combi filter. Reduces accidental spillage and helps prevent contamination of your water bottle. You can also use it as a tool for removing and inserting the ceramic filter element. Compatible with standard wide-mouth bottles, such as the ones made by Sigg and Nalgene.

There is one of these in the Katadyn Combi package but in case it gets lost or you need another one, here you go.