Maytronics
Maytronics Dolphin Non-Return Flap 9980891 – for Nautilus CC Supreme/Plus, M400/M500 & More
Maytronics Dolphin Non-Return Flap
Replacement internal flap designed to help prevent reverse water and debris flow in confirmed compatible Dolphin robotic pool cleaners.
Warranty Information
1-Year Manufacturer Warranty
Ultimate Pools is your first point of contact for compatibility verification, installation guidance, and warranty support.
The Maytronics Dolphin Non-Return Flap (9980891) is a replacement internal flow-control component designed for select Dolphin robotic pool cleaners. It helps prevent water and collected debris from moving backward within the cleaner during operation.
Replacing a worn, damaged or missing flap helps maintain the intended internal flow direction and supports proper filtration-system operation. Because internal configurations can vary between cleaner models and production versions, verify the cleaner model, product number and required replacement part before ordering.
Key Features
Supports the intended direction of internal water and debris movement during cleaner operation.
Helps reduce reverse movement of collected debris within the cleaner.
Forms part of the cleaner’s filtration and water-flow system.
Replaces a worn, damaged or missing non-return flap in a compatible cleaner.
Allows the affected internal part to be replaced without replacing the complete cleaner.
Designed for the confirmed cleaner models and product numbers listed below.
Compatibility & Fitment
Compatible with the following Dolphin robotic pool cleaner models and product numbers:
- Dolphin Aquarius XL: 99991079-AQI
- Dolphin C3 CB: 99991023-C3, 99991073-C3
- Dolphin C4 CB: 99991083-C4, 99991083-C4DEMO
- Dolphin Explorer E25 IoT CB: 99996406-XPW
- Dolphin Explorer E25 IoT CB Refurbished: 88886406-XPI
- Dolphin Explorer E40 Refurbished: 88881083-XPI
- Dolphin M200 CB: 99996403-US
- Dolphin M400 CB: 99991043-US
- Dolphin M500: 99991089-US
- Dolphin Nautilus CC Plus Refurbished Open Box: 66666403-PCF
- Dolphin Nautilus CC Plus IoT CB: 99996409-PCI
- Dolphin Nautilus CC Plus IoT CB Refurbished: 88886409-PCI, 66666406-PCI
- Dolphin Nautilus CC Plus IoT Open Box: 66666409-PCI
- Dolphin Nautilus CC Supreme: 99991083-PC
- Dolphin Nautilus CC Supreme Refurbished: 88881083-PC
- Dolphin Oasis Z5 CB: 99991079-OAS
- Dolphin Supreme M4: 99991013-US, 99991013-USDEMO
- Dolphin Supreme M5: 99991086-US
- Dolphin Supreme M5 Bio-S PVC: 99991087-BIO-US, 99991087-USDEMO
- Dolphin Supreme M5 Liberty PVC: 99994101-US
- Dolphin Wave 60 CB Refurbished: 88881060-US
- Dolphin Wave 65 CB: 99991023-W65, 99991023-W65DEM
- Dolphin Wave 90 CB: 99991083-W90, 99991083-W90DEM
Also compatible with the following part;
- Net Filter 70 Assembly (M Line): 9991429-ASSY
Compatibility may vary by production year, internal configuration and filtration-system design. Verify your exact model and part number before ordering.
Applications
- Replacing a worn non-return flap
- Replacing a cracked, damaged or missing internal flap
- Helping prevent reverse water and debris movement
- Restoring the intended internal flow direction
- Routine Dolphin robotic cleaner maintenance
Inspect the existing flap and surrounding filtration components before ordering to confirm that 9980891 is the correct replacement part.
Specifications
| SKU | 9980891 |
| UPC / EAN | 3701314134470 |
| Brand | Maytronics / Dolphin |
| Product Type | Robotic Pool Cleaner Non-Return Flap |
| Gross Weight | 0.044 lb / 0.02 kg |
| Compatibility | Select Dolphin Aquarius, C-Series, Explorer, M-Series, Nautilus, Oasis, Supreme and Wave robotic pool cleaners |
| Application | Internal water-flow and debris backflow control |
| Warranty | 1-Year Manufacturer Warranty |
| Final Sale | Yes |
Frequently Asked Questions
It helps prevent water and collected debris from moving backward within the cleaner’s internal flow and filtration system.
No. It is designed only for the cleaner models and product numbers listed in the Compatibility & Fitment section.
Replace it when the existing flap is worn, torn, cracked, missing or no longer controlling reverse flow correctly.
No. Filtration problems may also involve the filter assembly, bag, panels, basket or other internal components. Inspect the cleaner before ordering.
Yes. Confirm the cleaner model, internal configuration and required flap part number before purchasing.
This non-return flap includes a 1-year manufacturer warranty, subject to the manufacturer’s applicable warranty terms and conditions.
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