Here is the system that works with a duster:
The bellow hand duster is the duster that works with this system (comes with the kit linked above)
The standard size of the diamond braided cord on the Gotcha Sprayer Pro Adaptor is 18 inches.
Per the manufacturer, the Gotcha Sprayer Pro Adaptor has an adjustment range of motion of 140 degrees, so it will adjust much more than 90 degrees to the pole.
Gotcha Sprayer Pro Adaptor will work with Wasp Freeze.