Fluval 07 Impeller w/Ceramic Shaft/Rubbers 307
Water type
Freshwater + Marine
Fits
Fluval 307
Part no.
A20149
Fluval 07 Impeller w/Ceramic Shaft/Rubbers 307
The 307 part, and only the 307 part.
This is the genuine Fluval magnetic impeller assembly, part A20149, for the Fluval 307 canister filter. It comes complete with the ceramic shaft and rubber bushings. Fluval lists it against model code A446 alone — despite what a lot of listings claim, there is no single impeller that fits the whole 07 Series, and the 407 next to it on the shelf takes a different magnet.
Key features
- Genuine Fluval A20149 — matched to the 307 motor, so it picks up under load rather than humming and stalling on start-up.
- Whole rotating assembly — impeller, ceramic shaft and rubber bushings supplied together, so a rebuild does not leave one worn component behind.
- Restores the published 780 L/h — that is Fluval's circulation figure for a 307 with media in the baskets, and it is what a healthy impeller should give you back.
- The cheapest fix on a mid-size canister — a 307 motor head costs many times what the wear part inside it does.
- Five-minute job — the well is already open during a routine head clean. No tools.
Specifications
| Manufacturer part number | A20149 |
|---|---|
| Sold as | Single assembly |
| Assembly contents | Magnetic impeller, ceramic shaft, rubber bushings |
| Fits filter model code | A446 (Fluval 307) |
| Water type | Freshwater and marine |
| Tools required | None |
Will it fit my filter?
Each 07 canister runs its own impeller. The 107 and 207 share one; the 307 and 407 do not share anything.
| Filter | Model code | Impeller part | Takes A20149 |
|---|---|---|---|
| Fluval 107 | A440 | A20109 | No |
| Fluval 207 | A443 | A20109 | No |
| Fluval 307 | A446 | A20149 | Yes |
| Fluval 407 | A449 | A20169 | No |
Smaller canisters take the 107/207 impeller assembly; the largest takes the 407 impeller assembly. If you are not certain which canister you own, the model code is printed on the label on the underside of the motor head.
What flow you should be getting back
Fluval publishes two figures per canister. Pump output is measured on an empty canister and is the number on the box; filter circulation is measured with media loaded and is the number that matters in your cabinet.
| Model | Aquarium capacity | Pump output (empty) | Filter circulation (media loaded) | Max head | Power at 240 V |
|---|---|---|---|---|---|
| 307 | 90–330 L | 1,150 L/h | 780 L/h | 1.75 m | 15 W |
A 307 loses roughly a third of its headline flow to loaded media before a single hose is connected. Add the vertical lift from cabinet floor to tank rim — typically 0.6 to 0.9 m of the 1.75 m the pump can manage — and the real turnover on a 200 L tank is closer to three times per hour than five. That is normal, and it is why a fresh impeller feels like a much bigger upgrade than the numbers suggest.
What's included
- 1 x magnetic impeller
- 1 x ceramic shaft
- Rubber bushings
Not included
- The impeller cover. The plate over the well is the separate A20148 impeller cover for the 307 and 407.
- The motor head. If the motor itself has failed, you need the 307 motor head.
- Filter media. Foam, bio media and polishing pads are bought separately.
Suitable for, and not suitable for
Suitable for a 307 that has gone noisy, that needs the head tapped to start, or that has quietly dropped flow with clean media in the baskets. Also worth fitting straight away to any second-hand 307 of unknown history.
Not suitable for the 107, 207 or 407, for any 06 Series canister, or for the FX Series. It is not the answer to a canister that has stopped priming — that is usually the primer or an air leak at the AquaStop.
Care and maintenance
Lift the impeller out at each service and inspect it properly. Look for chipped vane tips, a hairline crack across the magnet, and a worn step on the ceramic shaft near either bushing. Any one of those means the assembly is done. Brush the well clean — mineral scale in there loads the motor and shortens the next impeller's life. Marine tanks are harder on impellers than freshwater, so check yours more often if you run salt.
Goes well with
- Impeller cover 307/407 (A20148) — replace alongside if the cover has cracked and let the impeller run loose
- Ceramic impeller shaft and bushing (A20039) — the cheaper fix when only the shaft has worn
- 307/407 media basket cover — stops water bypassing the media
- 07 Series primer assembly — for a canister that will no longer self-prime
Warranty and delivery
Supplied as a genuine Fluval replacement part. Your rights under the Australian Consumer Law apply in full and nothing here limits them. Fluval does not quote a separate warranty term on wear parts. Ships as a standard small parcel anywhere in Australia.
Common questions
Does the Fluval A20149 impeller fit a 407?
No. The 407 takes A20169. A20149 is listed by Fluval against the 307 alone, and the two magnets differ in size and strength.
Is there one impeller that fits every 07 Series filter?
No, and listings that say so are wrong. The 107 and 207 share A20109; the 307 takes A20149; the 407 takes A20169.
Will a 306 impeller fit my 307?
No. The 06 and 07 canisters share some moulded parts, but the impeller assembly is model-specific and does not carry across generations.
My 307 has lost flow but the impeller looks fine. What else should I check?
Clogged foam is the usual answer, followed by a furred intake strainer and then internal buildup in the hoses. A hose that looks clear from the end can still be half-lined with sludge along its length.
Does this include the ceramic shaft?
Yes. The shaft and the rubber bushings come with the impeller. The shaft is also available on its own as A20039 if the impeller itself is still serviceable.
