Seachem Laboratories Glass Inline Diffuser (17 mm)
The 13 mm glass inline diffuser is a pollen-style inline CO2 diffuser designed to be placed in the outflow line of your filter or aquarium pump. It efficiently diffuses CO2 gas into the aquarium without requiring a diffuser inside the tank, reducing visibility of the CO2 system in the aquascape.
By placing the diffuser in the external flow line, CO2 is dispersed more rapidly and consistently, helping to maintain stable levels and reduce CO2 waste or overdose.
Specifications
| Item | Model |
|---|---|
| Size | 17 mm |
| Quantity | 1 piece |
| Material | Glass |
| Use | Inline CO2 diffusion in aquarium systems |
FAQ
How does the inline diffuser work?
The diffuser is placed in the outflow line of the filter or pump. As water flows through, it carries CO2 gas which is then dispersed into the water column, allowing for efficient and consistent CO2 delivery.
Can this diffuser be used with any aquarium pump or filter?
Yes, it is compatible with most aquarium pumps and filters that have an outflow line.
Is the diffuser easy to install?
Yes, installation is straightforward. Simply insert the diffuser into the outflow line of your filter or pump and secure it in place.

Andrew Newman –
I installed this diffuser in my filter outflow and noticed a more stable CO2 level in the tank. The glass design is clear and doesn’t interfere with the tank’s appearance. Works well with my planted tank setup.
Alexandra Short –
The diffuser fits perfectly in my pump’s outflow line. CO2 diffusion is smoother than before, and I no longer see bubbles in the water column. Easy to install and reliable.
Bella Morgan –
After switching to this inline diffuser, my plants have shown better growth. The system is clean and the CO2 delivery is consistent. No leaks or clogs reported after several weeks of use.