Marina Slim Filter flow regulator cap

thingiverse

I purchased a second-hand aquarium that was missing its regulator cap, so I reverse-engineered and 3D printed my own with ease. This custom-made part fits perfectly on the Marina Slim Filters, requiring only a simple rubber o-ring with an internal diameter of approximately 12mm and an external diameter of 16mm. As a last resort, you could even use a rubber band wrapped around it several times to get the job done.