Fluval Motor Head O-Ring Gasket For 300/400 Series Canister Filters (304, 305, 306, 307, 404, 405, 406, 407)

Is your Fluval canister filter leaking or not priming right?

The culprit might be a worn-out O-ring on the motor head.

This is a replacement gasket designed to fit the 300 and 400 series models—specifically the 304, 305, 306, 307, 404, 405, 406, and 407.

It's a brand new, unbranded O-ring that does the job just as well as the original part (cross-references A20063 and A20064).

A simple, cheap fix that can save you from a messy floor and keep your aquarium water crystal clear.

Get your filter sealing tight again!