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Maytronics Dolphin Diaphragm 2010, Pair | 9991046-ASSY

Maytronics SKU: 9991046-ASSY

Maytronics Dolphin Diaphragm 2010, Pair | 9991046-ASSY

Maytronics SKU: 9991046-ASSY
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Maytronics 9991046-ASSEMBLY Rapid Drain Flaps / Diaphragm Pair (Set of 2) for Dolphin Robotic Pool Cleaners | Genuine Replacement

The Maytronics 9991046-ASSEMBLY (also commonly listed as 9991046-ASSY) is a genuine Dolphin robotic pool cleaner replacement rapid drain flap kit, also described by many sellers as a diaphragm pair. This kit includes 2 flaps/diaphragms used in compatible Dolphin cleaners to help control water drainage and internal flow during operation and when lifting the cleaner from the pool.

Key Features

  • Part number: 9991046-ASSEMBLY / 9991046-ASSY
  • Brand: Maytronics (Dolphin genuine part)
  • Product type: Rapid drain flaps / diaphragm replacement kit
  • Quantity: Set of 2
  • OEM replacement part for compatible Dolphin robotic pool cleaners
  • Helps maintain proper drainage and cleaner handling performance

What This Part Does

  • Replaces worn, torn, or damaged rapid drain flaps / diaphragms
  • Helps water drain more efficiently when removing the cleaner from the pool
  • Supports proper internal water flow behavior in compatible cleaner housings
  • Helps restore normal cleaner performance when old flaps have hardened or failed

Common Compatibility Notes (Verify Before Ordering)

  • Commonly listed for select Maytronics Dolphin robotic cleaners in families such as M200/M400/M500, C3/C4, Nautilus CC Plus / Supreme, Triton Plus, Oasis Z5/Z5i, Sigma, and select Wave models (version dependent)
  • Retailer compatibility lists vary widely by model revision and regional naming
  • Always verify your exact cleaner model and existing part number before ordering

Important Notes

  • This item is commonly described using two names: rapid drain flaps and diaphragm pair.
  • The suffix may appear as -ASSY or -ASSEMBLY depending on the seller listing format.
  • Confirm whether your service job requires only the flap pair or additional housing/seal components.

Installation Notes

  • Disconnect the cleaner from the power supply before servicing.
  • Open the relevant housing area per your Dolphin service procedure and remove the worn flaps/diaphragms.
  • Install the new flaps in the same orientation as the originals.
  • Inspect surrounding plastic tabs, seats, and seals for wear while the cleaner is open.
  • Test cleaner operation and drainage behavior after reassembly.

Related Products (Aqua Pool Supply)

Maintenance Tips

  • Inspect drain flaps/diaphragms periodically if the cleaner feels unusually heavy when lifting from the pool.
  • Rinse the cleaner after use to reduce buildup that can stiffen or damage rubber components.
  • Replace worn flaps promptly to help maintain proper drainage and cleaner handling.
  • Check nearby seals and moving parts during service to prevent repeat disassembly later.
Questions about returns? View our return policy.

Hours Of Operation: 

Monday - Friday: 8:00 am to 4:00 pm Phoenix Time

Saturday and Sunday: Closed

  • Orders costing more than  $300 WILL be required to have signature confirmation upon delivery.
  • Handling time is typically only 1 day.   
  • Any item ordered after 1pm Phoenix time, may not ship same-day.
  • Call us if you require expedited shipping and we can give you quotes based on your needs.

Return Policy:

  • All products, except as noted below, are eligible for return up to 30 days after receipt of item.
  • For returns, an RMA form must be filled out HERE or customers can call for additional help.
  • Shipping costs will be deducted from all returned items.
  • Any item that is missing accessories, original packaging, or is not returned in the same condition that it was received in, may be subject to a re-stocking fee up to 100% based on the condition we receive it in. 
  • Items broken, damaged, or inoperable due to installer error will not be refunded.
  • Fill out the return form or give us a call to obtain an RMA and return shipping label.
  • There are no returns on the Pentair Colorsync 618031
  • No returns on pool cleaners.
  • No returns on opened seals and o-rings.
  • No returns on capacitors.
  • If a light is returned because it "doesn't work" and it tests fine, the cost to ship and a re-stocking fee will be deducted from the refund.
  • All products denied upon arrival at customers house WILL be charged the cost to ship.
  • Visa Gift Card Promotions: Gift cards are sent within 14 days of the order. When accepting the Visa Gift card, you agree that if your order is returned or refunded, this amount will be deducted from the refunded amount. All Visa Gift cards are sent via email in an E-Gift Card format and are non refundable.
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