3/4 in garden hose female to 18mm barb adapter

An adapter to allow you to descale your water heater with some cheap tube and an aquarium pump.
If you screw it all the way on and still get a leak, borrow a gasket from another hose and stuff it in there.

print on the narrow end with a brim and a tough filament

Design by naavox on MakerWorld (license: CC0).