
Quick overview
- Sold as a pair Two diaphragms in one order, which is how these are normally changed.
- Genuine Maytronics The factory 9991046-ASSY part for Dolphin robotic cleaners.
- Wide Dolphin fitment Used across the M200, M400, Nautilus Plus, Triton Plus, C3 and C4 families.
- A wear item Diaphragms flex constantly in service, so they harden and tear long before the cleaner does.
- Restores suction behavior A split diaphragm changes how the cleaner draws water and shows up as weak pickup.
- Straightforward swap Replaced during normal cleaner servicing without special tools.
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Product details
The Maytronics 9991046-ASSY is the replacement diaphragm for Dolphin robotic pool cleaners, supplied as a pair. It is the genuine Maytronics part.
Why it wears out
The diaphragm flexes every minute the cleaner runs, in warm chlorinated water. Over a few seasons the rubber stiffens, then cracks, then splits. Owners usually notice it as a cleaner that still drives its pattern but no longer picks up the way it used to, and they replace the filter or blame the motor before checking the diaphragms.
Fitment
This part is used across a wide slice of the Dolphin range, including the Supreme M5, C3 Cb, C4 Cb, M400, M200, C3 Dynamic, Nautilus Plus and Triton Plus. Because they are changed as a set, this listing supplies two.
| Brand | Maytronics |
|---|---|
| Manufacturer part number | 9991046-ASSY |
| Type | Diaphragm |
| Quantity | Sold as a pair |
| Fits | Dolphin Supreme M5, Dolphin C3 Cb, Dolphin C4 Cb, Dolphin M400, Dolphin M200, Dolphin C3 Dynamic, Dolphin Nautilus Plus, Dolphin Triton Plus |
| Shipping weight | 0.1 lb |
| Ships | Parcel |
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