Fluval FX5/FX6 Motor Seal Ring

This genuine Fluval motor seal ring fits FX4, FX5, and FX6 High Performance Filters, ensuring a reliable, leak-free seal.

Fluval Motor Seal Ring is suitable for the Fluval FX5 and FX6 High Performance Filters. The FX2 and FX4 take a different ring, item A20211.

The Fluval FX5/FX6 Motor Seal Ring is a replacement part for keeping your filter running at full performance — see our guide to choosing filter media for how media and hardware work together in a filtration system.

Compatibility

FX5 and FX6. Fluval's own service documentation puts item A20207 inside the FX6 service kit (A20259), alongside the FX5/FX6 impeller assembly A20206. The FX2 and FX4 take a different ring, item A20211, which is a separate part at a fraction of the price — ordering the wrong one is easy and the packs look alike.

Fluval publish no standalone product page for A20207, so the item number on your old ring, or on the service kit, is the only reliable check. If you are unsure which you have, send us a photograph of the part and we will tell you.

Setup & Use

Fluval's FX chart: check and clean the motor seal ring every three months, and replace it yearly. This is the seal between the motor unit and the canister. When it perishes the filter does not stop — it weeps, usually at the back of a cabinet where nobody is looking.

Close the valves, unplug, then drain. Before any part of a canister filter comes off, Fluval's sequence is: turn the IN and OUT valves to the closed (horizontal) position, unplug the pump, then disconnect. The canister sits below the tank and is full of water — opening it in the wrong order empties it onto the floor, and on an FX4 or FX6 that is fourteen to twenty litres.

Silicone lubricant only. Fluval are explicit about this in both the 07 Series and FX manuals: seals and O-rings are lubricated with a silicone-based lubricant only, and they name their own Fluval Silicone Lubricant (item #A325). Petroleum jelly and vegetable- or animal-based products are not to be used, and Fluval say that using anything else voids the guarantee.

Safety & Precautions

Close the valves, unplug, then drain. Before any part of a canister filter comes off, Fluval's sequence is: turn the IN and OUT valves to the closed (horizontal) position, unplug the pump, then disconnect. The canister sits below the tank and is full of water — opening it in the wrong order empties it onto the floor, and on an FX4 or FX6 that is fourteen to twenty litres.

Unplug everything in the tank before your hands go in the water. That is Fluval's own instruction and it covers every appliance in the aquarium, not just this one. Grasp the plug and pull it; never yank the cord.

A spare is only as safe as the unit it goes into. Fluval's standing instructions still apply to the filter itself: the power cord cannot be replaced or cut, a unit that has been dropped or shows abnormal leakage should not be put back into service, and repairs go to an authorised service facility rather than a kitchen table.

Specifications

Fluval item #A20207. The motor seal ring for the FX5 and FX6 canister filters — the O-ring that seals the motor unit to the canister body.

Fluval publish no dimensions for this part, and no standalone product page for it. The only place they document it is the contents list of the FX6 service kit (A20259). We would rather say so than print a measurement we cannot source: the item number identifies the part exactly, and it is one you match rather than measure.

What's in the Box

One motor seal ring. Fluval item #A20207 — the ring alone, with no lubricant and no other gaskets in the pack. If you want the seal ring together with the impeller assembly, the four top-cover click-fit O-rings and the filter lid O-ring, that bundle is the FX6 service kit, item A20259.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number — or email us, if you would rather — and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 72 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.