The Ross Valve is a worthy successor of the Moose Valve.
This combination valve/watertrap installs into the blowpipe stock easily using a tool provided.
The valve negates the need for a clacker valve on your blowpipe. The device also stops moisture from dribbling into the bag.
Remove your blowstick and dump it out when you’re finished playing. It’s not as effective as a tube trap or a desiccant system, but for the casual player it’s convenient and all they need for moisture control.