If you’re wondering how [Curt] managed to 3D print a functional hose sprayer, the short answer is that he didn’t. Once assembled, the printed parts cleverly attach to the top of a standard sprayer, specifically the model 56516 “Pro Flo” from Orbit.

Boo, would have been neat if he got a working sprayer from only 3d printed parts. But that would be pretty unreasonable due to the pressures and the need for valves.