This part is not the swivel for the F&P Simplus mask, but the adapter that fits into the hose and then clips onto the Simplus swivel. For some reason, it's very hard to find, but this is exactly the part I was looking for. I had purchased a second, longer hose for camping, and always managed to forget to take this piece with me. Now, I don't worry about that anymore. Friendly service, and delivery was fast enough.