Magnetic spray bar holder
thingiverse
I'm replacing the suction cup holder on my aquarium filter's spray bar with a new one. To do this, I used epoxy-coated magnets that I purchased from Amazon - they have a diameter of 32mm and are 5mm thick, so even if water seeps into the enclosure, there should be no unwanted chemical reaction. The clamp itself is designed as a separate piece for easy replacement in the future.
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