The popular Moose Valve is a combination valve and water trap that is installed in the blowstick stock.
The Moose Valve has a wide diameter and is not restrictive. It is inserted into the bottom of the blowstick stock and expands into place making an airtight seal. It can be used in any bag with any pipes. It also doubles as a water trap. Great for those who never want to worry about an air tight seal, or those who like double protection!