The Fluval A20155 is an official replacement impeller cover designed for older-model Fluval 304 and 404 external canister filters. It is specifically engineered to hold the impeller and ceramic shaft in place, and is exclusively compatible with impellers that feature curved fan blades.

• Filter Compatibility: Fluval 304 and 404 series (manufactured before July 2001).
• Impeller Type: Strictly for use with pink/curved fan blade impellers (not for later models with straight blades).
• Purpose: Ensures the proper functioning, noise reduction, and optimum water flow of your canister filter