For those of you without a pool cleaner, a TailSweep is an attachment that goes on the tail of a pool cleaner. It keeps water from squirting out of the pool. However, over time the TailSweep can become loose. They want you to throw it away and buy a new one. But they are like $30 each. This is a cap for a Polaris TailSweep it goes over the back of the TailSweep to hold it in place. This works no matter how old your TailSweep is. A nice little cost savings print. I think a lot of pool parts are just over-priced pieces of plastic that 3D printing could revolutionize.