I've added one version with a inbuilt nut and another with knurling.
The internal valve should be printed with 100% infill. The included .gcode files are configured to print the valve at 100% infill, while the outer body is set to 4 walls and 15% infill.
2024-06-30: Fixed a problem with the female threaded version, reported by @Greenfrog_1428123
2024-06-18: Added a female threaded version with a hex nut & knurling.
2024-06-06: Added a version with a hex nut and some knurling.
A big thank you to the original designer for sharing their design:
Shaker siphon for garden hose by DrJones | Download free STL model | Printables.com
The author remixed this model.
Added a inbuilt nut and knurling.