Remix of another Hozelock fitting. The base has been expanded for strength as the original I made in PLA+ split on first use. Possibly slightly over-engineered, but I've now printed two, they both work perfectly and I see no need to fiddle further!

Creality

Ender 3

Doesn't Matter

100%

The previous design seemed just slightly too small , so I expanded this one by 1% in the slicer each time until I got a perfect fit. You will need Hozelock O-rings for the top/male part of this, but spreading a little silicone sealant around the inside seemed to replace the need for an interior washer between that and the reel.