This adapter is designed for sponge filters to make them work even better!

It connects easily with an air inlet on top and redirects the flow 90° so that water and air exit sideways. This creates strong surface agitation, giving your aquarium excellent oxygen exchange.

It also solves a common problem with air filters: instead of bubbles popping directly above the filter and leaving tiny splashes, this adapter directs the flow cleanly and effectively. Your tank stays neater, and your fish get healthier water circulation.

If you like this design, please boost this model so more aquarists can discover it!

Have an idea for an improvement? Drop a comment—I’d love to hear your feedback and keep refining the design.

2026.02.21

Added +10 cm, and +18cm version.