A common pool adapter. Fits 1.5" hose connections. Both ends taper from 1.43" to 1.55".
Why buy a new one when yours breaks? Just print it!
Print it, then if your printer uses ABS, coat it with standard ABS cement to make it smooth, glossy and air-tight.
The cement is available at any hardware store in the plumbing department. It is used for gluing ABS drain pipes together. It comes in black and some stores also carry a clear version. It is pretty fast and glues ABS together way better than superglue, everyone who prints in ABS should have a can. The built-in applicator works fine for this project, but you might want to have some cotton swabs around for smaller pieces.
Work fast with the cement, smooth it on before it turns gloppy. Don't coat it too thick or it may not fit your hose.