UNS Pro Inline CO2 Diffuser

It works on a Fluval 307 canister filter perfectly.

It perfectly fits a Fluval 307 hose. The bubbles are very small, not totally invisible, but small enough to not be really noticeable.

Bubbles and quality were great. Was the size I was looking for my cube.

Great Product!

Great product! Very high quality, top material used for build.