Standard 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 :)