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Maytronics Dolphin Bottom Lid Assembly | 99919116

Maytronics SKU: 99919116

Maytronics Dolphin Bottom Lid Assembly | 99919116

Maytronics SKU: 99919116
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Maytronics 99919116 Bottom Lid Assembly with Support (Dolphin Robotic Pool Cleaner Replacement Part)

The Maytronics 99919116 is a genuine Dolphin robotic pool cleaner bottom lid assembly with support. It is commonly listed as a complete bottom lid assembly (D. Basic & Support) used on many Dolphin cleaner models, and it serves as the lower assembly where the filter bag/support components mount.

Key Features

  • Part number: 99919116
  • Brand: Maytronics (Dolphin genuine part)
  • Product type: Bottom lid assembly with supports
  • Common description: Bottom Lid Assy D. Basic & Support / Bottom Lid Assy and Rails
  • Function: Lower cover assembly for compatible Dolphin robotic pool cleaners
  • Commonly listed warranty: 1 year (listing/manufacturer dependent)

What This Part Does

  • Replaces a damaged, worn, or missing bottom lid assembly on compatible Dolphin cleaners
  • Provides the lower support structure for filter bag/cartridge-related components (model dependent)
  • Helps restore proper fitment and cleaner operation when the original lower assembly is cracked or broken
  • Maintains OEM fit and function when matched to the correct cleaner model

Common Compatibility Notes (Verify Before Ordering)

  • Used on many Maytronics Dolphin robotic pool cleaner models
  • Common retailer references include models in the DX3 / DX4 / M3 family and other legacy Dolphin variants (fitment varies by model/version)
  • Some listings identify this as the complete bottom lid assembly used where the bag attaches
  • Always verify your exact cleaner model and existing part number before ordering

Common Included / Assembly Notes

  • Often sold as a bottom lid assembly with supports/rails and related lower-lid hardware (exact included pieces may vary by seller listing)
  • Some listings describe it as replacing the bottom lid assembly and stainless supports
  • Verify whether your installation requires additional filter bag/base components that may be sold separately

Installation Notes

  • Disconnect the cleaner from the power supply before servicing.
  • Remove the old bottom lid assembly and inspect surrounding parts for wear or damage.
  • Transfer any reusable compatible components as needed, following your cleaner’s service instructions.
  • Confirm the lid assembly seats properly and opens/closes/functions correctly after installation.
  • Test cleaner operation and filter fitment before returning the unit to regular use.

Related Products (Aqua Pool Supply)

Maintenance Tips

  • Rinse the bottom lid area after each cleaning cycle to reduce debris buildup.
  • Inspect hinges, supports, and flap areas regularly for cracks or wear.
  • Keep filter components clean to reduce strain on the lower assembly.
  • Replace damaged lid assemblies promptly to maintain proper debris capture and cleaner performance.
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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