Gardena shower hose adapter
thingiverse
this litte thing adapts a common shower hose to any kind of garden hose plugs. Thread diameter is approximately 21mm. I use it to fill my aquarium. Link to O-Ring: https://www.amazon.de/GARDENA-Ring-Vielseitiger-Dichtungsring-Anschlussnippel/dp/B0001E3XTA/ref=sr_1_5
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