aquarium auto top off
Description
This cap is an aquarium auto topped off system. It was designed to reuse a cola bottle to refill water into fish-tank automatically. The system works on Glass fish-tank only, don't use it in plastic fish tank. There are 2 files included (.4mm and .5mm) for different glass thickness. As commented by someone, I will try to design a larger one to reduce the pressure on a small area of tank glass...
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