The Fluval A20040 is a specific ceramic impeller shaft assembly designed for older-generation Fluval 104 and 204 canister filters.
It is specifically engineered to be used with impellers that have curved fan blades.

• Compatibility: Fluval 104 and 204 external canister filters only.
• Function: Provides the central axis that holds the magnetic impeller in place, allowing it to spin and pump water smoothly without corrosion.
• Replacement: Ceramic shafts are highly durable but can become brittle and snap during routine filter cleaning or if handled roughly.