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Pentair Max-E-Pro IntelliPro Seal Plate Square O-Ring | 357099Z

Pentair SKU: 357099z

Pentair Max-E-Pro IntelliPro Seal Plate Square O-Ring | 357099Z

Pentair SKU: 357099z
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Pentair 357099Z Seal Plate Square Ring (Seal Plate Gasket / O-Ring)

The Pentair 357099Z is a square-profile seal plate ring used to seal the joint between the pump seal plate and housing. Replacing this gasket helps stop external water leaks and helps prevent air from being drawn into the pump (which can affect priming and performance).

Common Applications

  • Seal plate-to-housing sealing surface on select Pentair and Sta-Rite pump wet ends
  • Often referenced as a “seal plate gasket”, “seal plate square ring”, or “seal plate O-ring (square profile)”

Compatibility (Verify by Pump Model / Manufacturing Date)

  • Commonly listed for Pentair IntelliFlo / IntelliPro, WhisperFlo, and SuperFlo VS pump families
  • Also commonly listed for Sta-Rite SuperMax VS and related Sta-Rite/Pentair wet ends that use a square-profile seal plate ring
  • Some references specify versions manufactured from February 2015 and later for certain pump lines

Because pump wet ends can change across revisions, confirm the part by comparing your existing seal plate ring (profile and diameter) and your pump’s parts diagram.

Key Features

  • Square-profile cross-section helps seat securely in the seal plate groove
  • Restores a tight seal to reduce drips at the seal plate seam
  • Helps support proper priming by reducing air infiltration at the wet end joint
  • Designed for pool/spa water environments (chemical and temperature exposure typical of pump operation)

Installation Notes

  • Shut off power at the breaker and relieve system pressure before opening the pump.
  • Disassemble wet end enough to access the seal plate-to-housing seam.
  • Remove the old square ring and clean the groove and mating surfaces (no debris, scale, or old gasket material).
  • Lightly lubricate the new ring with a pool-safe silicone lubricant (do not over-lube).
  • Seat the ring evenly in the groove (no twists), then reassemble and tighten fasteners evenly in a cross pattern.
  • After reassembly, prime the pump and check closely for drips at the seal plate seam.

Signs You May Need This Part

  • Water dripping or weeping from the seam where the motor/seal plate meets the pump housing
  • Air bubbles returning to the pool and difficulty maintaining prime (when other suction-side issues are ruled out)
  • Wet-end disassembly service where the seal plate ring was disturbed or flattened

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Maintenance Tips

  • Keep the pump lid O-ring and sealing surfaces clean and lightly lubricated to reduce air leaks and strain on seals.
  • Any time the wet end is opened, inspect all O-rings/gaskets for flattening, nicks, or chemical swelling and replace as needed.
  • Do not use petroleum-based lubricants—use a pool-safe silicone lubricant only.
  • If leaks persist after replacing this ring, inspect the seal plate and housing for warping, cracks, or uneven tightening.
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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