Pro Flow Drone Valves
If you want to refine your playing and improve efficiency and steadiness quickly, Pro Flow drone valves can help. The valves are well designed and are easily adjusted by turning the screw. At the right setting, the valves will allow the optimum amount of air to pass through, but will regulate flow to prevent overblowing when too much air would normally pass through and create modulations in sound. There are no tools required and no elastics to stretch.
Features of Pro Flow Drone Valves:
Note: A zippered pipe bag is required for installation