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Pentair WhisperFloXF Trap Cover O-Ring 35505-1440Z

Pentair SKU: 35505-1440Z

Pentair WhisperFloXF Trap Cover O-Ring 35505-1440Z

Pentair SKU: 35505-1440Z
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Pentair 35505-1440Z Lid/Locking Ring O-Ring

The Pentair 35505-1440Z is a replacement lid/locking ring O-ring used on select Pentair and Sta-Rite pool pump strainer assemblies. This O-ring helps create a tight seal between the pump lid and pump trap body, helping prevent air leaks, water leaks, and loss of prime.

Product Features

  • Genuine Pentair replacement O-ring
  • Part number: 35505-1440Z
  • Also commonly listed as 35505-1440
  • Used for the pump trap cover, lid, or locking ring seal
  • Approximate dimensions: 6.90 inch outer diameter x 6.35 inch inner diameter
  • Helps restore a proper seal on compatible pump strainer lids

Common Compatibility

  • Pentair IntelliFloXF variable speed pumps
  • Pentair WhisperFloXF pumps
  • Sta-Rite IntelliProXF variable speed pumps
  • Sta-Rite Max-E-Pro series pumps
  • Sta-Rite Max-E-Pro XF series pumps
  • Sta-Rite Dyna-Pro and Dyna-Pro E pumps
  • Select Dyna-Wave pump applications

When to Replace

Replace this O-ring if the pump lid is difficult to seal, the pump is pulling air, the lid area is leaking, the O-ring is stretched, flattened, cracked, brittle, or no longer sits properly in the groove. A worn lid O-ring can cause priming problems and reduced pump performance.

Installation Tips

  • Turn off power to the pump before servicing.
  • Relieve pressure from the system before removing the pump lid.
  • Remove the old O-ring and clean the lid and O-ring groove thoroughly.
  • Apply a light coat of pool-safe silicone lubricant before installation.
  • Seat the O-ring evenly in the groove before tightening the lid.
  • Hand-tighten only unless your pump manual states otherwise.

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Maintenance Tips

Inspect the pump lid O-ring whenever cleaning the pump basket. Keep the O-ring clean and lightly lubricated to help prevent sticking, twisting, and premature wear. Do not use petroleum-based lubricants, as they can damage rubber seals. Always verify your pump model and existing part number before ordering replacement parts.

Questions about returns? View our return policy.

Hours Of Operation:

Monday - Friday: 7:00 am to 5:00 pm Phoenix Time

Saturday: 8:00 am to 2:00 pm

Sunday: Closed

  • We do not ship on Saturday or Sunday.
  • Orders totaling more than $300 will require signature confirmation upon delivery.
  • We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
  • Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
  • Expedited shipping options are available at checkout.

Return Policy:

  • Products that are received damaged will receive a refund in store credit.
  • Most products are eligible for return within 30 days of receipt, except where noted below.
  • To initiate a return, please complete an RMA form prior to sending your item back.
  • Original shipping costs are non-refundable and will be deducted from the return credit.
  • Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
  • Some returns will be charged an automatic 15% restocking fee.
  • We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
  • Please complete the return form to receive your RMA number and return shipping label.
  • Chemical products are not eligible for return under any circumstances.
  • The Pentair Colorsync 618031 is not eligible for return.
  • Pool cleaners are not eligible for return.
  • Opened seals and o-rings are not eligible for return.
  • Capacitors are not eligible for return.
  • Plastic popup tools are not eligible for return.
  • Automation components and circuit boards are not eligible for return.
  • If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
  • Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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