The Maytronics Dolphin M400 takes the Dolphin M400/M500 fine filter panels 9991433-ASSY (set of 4) as its filter; Australian sellers list it from A$140.34 as of 28 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your pool cleaner
Maytronics Dolphin M400
Pool cleaner
Confirmed against Maytronics's listConfirmed against Maytronics's own compatibility list
Not yours? Change
Takes the 9991433-ASSY filter
Dolphin M400/M500 fine filter panels 9991433-ASSY (set of 4) · check the code printed on your old filter before ordering.
Your pool cleaner
Pool cleaner
Confirmed against Maytronics's listConfirmed against Maytronics's own compatibility list
Takes the 9991433-ASSY
Filter · check the code on your old filter.
Other Maytronics pool cleaners that take the 9991433-ASSY
GenuineGenuine Maytronics
$140.34
Maytronics Australia · 28 OctLowest genuine · Maytronics Australia · checked 28 Oct
CompatibleCompatible option
See seller
No compatible seller tracked yetNo compatible seller tracked yet
Genuine: made by Maytronics. Compatible: another brand.Genuine is made by Maytronics. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest price · $140.34
Maytronics Australia. Every seller we track is listed below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Other parts this pool cleaner takes
- Dolphin dual-drive combined brush, grey (1 piece)Open Maytronics Australia$27.71
The brush. The M400 CB comes with combined brushes and the M400 WB with wonder brushes. Takes 4. Separate from the filter. Replace every 12 months.
- Dolphin dual-drive wonder brush 9995560-ASSY (2 pieces)Open Maytronics Australia$91.94 each · 2-pack $183.88
The brush. Wonder brushes: Maytronics recommends them for smooth surfaces such as tiles, fibreglass and smooth concrete. Comes as a 2-pack; 4 are needed. Separate from the filter. Replace every 12 months.
Compare 1 seller
AUD, before delivery. Each price shows when it was checked.
Opens Maytronics Australia in a new tab. Their page is the source of truth for price, delivery and returns.
How long it lasts
Replace it when the mesh is torn, cracked or worn at the edges, or stays brown or green after a deep clean, Maytronics says; rinse it after every cycle and deep-clean it about once a month.
After replacing: No reset needed. Robots with a filter indicator on the power supply or app clear it after the filter is cleaned and a new cycle starts; the manual for your model has the details.
How to change the filter in your Maytronics Dolphin M400
Watch the guide or follow the steps.
- 1Switch off and unplug the power supply. Use the floating cable to bring the robot to the edge, then lift it out by its handle (never by the cable) and let the water drain.
- 2Open the filter covers and take the cartridges out from both sides of the robot.
- 3Open the clips and remove the old filter panels.
- 4Fit the new panels: put the locating tabs at the bottom of each panel into their grooves on the frame, then close the S clip.
- 5Slide the cartridges back into both sides and close the filter covers.
Every number this part goes by
- Retail name:
- 9991433
- Retail name:
- 9991433-ASSY
- Retail name:
- 9991433-R4
Sellers list any of these; they are the same part.
About your Maytronics Dolphin M400
Maytronics pool cleaner — Dolphin M Line. Its filter is the Dolphin M400/M500 fine filter panels 9991433-ASSY (set of 4), part 9991433-ASSY.
Other filters the maker lists for this pool cleaner: Dolphin M400/M500 ultra-fine filter panels 9991432-ASSY (set of 4). Ultra-fine cartridge panels: for fine dirt and dust.
Also in this pool cleaner:
- Dolphin dual-drive combined brush, grey (1 piece) (every 12 months). The M400 CB comes with combined brushes and the M400 WB with wonder brushes. Takes 4.
- Dolphin dual-drive wonder brush 9995560-ASSY (2 pieces) (every 12 months). Wonder brushes: Maytronics recommends them for smooth surfaces such as tiles, fibreglass and smooth concrete. Comes as a 2-pack; 4 are needed.
Where the model number is: On a robot the model is on the label on the cleaner's body, often underneath, or on its power supply; unplug the power supply and lift the robot out of the pool before you turn it over. On a Polaris pressure cleaner it is on the body and the box.
Fits these 2 Maytronics models
Maytronics2 models
Common questions
- Which filter fits the Maytronics Dolphin M400?
- The Maytronics Dolphin M400 takes the Dolphin M400/M500 fine filter panels 9991433-ASSY (set of 4).
- Where can I buy the 9991433-ASSY in Australia?
- We track 1 Australian seller for the 9991433-ASSY; the lowest listed price when we last checked was A$140.34 at Maytronics Australia. Prices are re-checked daily and dated on this page.
- How do I fit the 9991433-ASSY in a Maytronics Dolphin M400?
- No tools, a few minutes: 5 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- A clogged filter slows the cleaner and it picks up less; a torn one lets fine dirt pass straight back into the water.
- Is there anything to reset afterwards?
- No reset needed. Robots with a filter indicator on the power supply or app clear it after the filter is cleaned and a new cycle starts; the manual for your model has the details.
Something looks wrong with the Dolphin M400 match? . Reports go to a person, not a bot.