This is a great product if you do not want to mess with a ladder, or if you are confined to a wheelchair. And, if you use foaming spray to eliminate wasps this is the right product. The foaming sprays go only 12 feet at best. Total Kill by Ortho only went 12 feet when spraying on a calm day. The Spray Close Spray Extender helped reach 20 feet and cover the entire nest with less harm to the enviornment as fewer chemicals were needed.
The great thing about the Spray Close Spray Extender is that it can also be used to clean windows, spray on prunning sealer on cut branches, and apply spray paint to hard to reach places, like flag poles. I have used it to clean the inside windows of our great room by spraying window cleaner on the second story level and then attaching my mop to my extension pole and wiping the window down - the windows were crystal clear and I did not have to get out my ladder.
The product is available at Amazon.com, but it also can be found in some local hardware chains too.