Standard gardena / garden hose to ¾ pipe thread adapter, as it is used in e.g. sprinkler systems, pumps or water switches. This version has another design than my first one, this one is more rounded while my fist model has sharper edges and a knurled design. Seal and O-Ring can also be found in my other models. 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.