The red male acme threaded tip, or REACH/AROUND as it was named back in 2010 has been helping window cleaners add accessories to their water-fed poles for years.
The male thread will accept many different accessories such as cone tips, doodlebugs, squeegees, bronze wool pads, etc.
To install simply unassemble your current plastic adjustable gooseneck and insert this red piece in between the 2 halves. You will need a longer bolt than the one currently in your gooseneck and this is not provided due to so many different bolts being utilized in goosenecks today.