A end cap for ¾ inch pipe threads as they are used in gardena hose pipe systems. The rubber seal can be found in a separate model as a complete seal and O-Ring set. Print in high quality for a good thread, will still need a bit of force on the first screw action. Happy watering :)
Disclaimer: I use the term Gardena as a reference term for the famous garden hose connecting system. I did not take any replicas from their designs or IPs specifically. I did my measurements and testfits on *any* system adapter I had laying around without the knowledge who made it.