Hayward O-Ring Kit 2-Pack | DEX2420Z8A

Hayward Products SKU: HPPDEX2420Z8A
Hayward O - Ring Kit 2 - Pack | DEX2420Z8A - Pool Filter Parts - img - 1

Hayward O-Ring Kit 2-Pack | DEX2420Z8A

Hayward Products SKU: HPPDEX2420Z8A
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Hayward DEX2420Z8A O-Ring Kit (Set of 2) for Manual Air Relief Assembly – Pro-Grid® / SwimClear® / HCF

The Hayward DEX2420Z8A is an OEM O-ring kit (set of 2) used to reseal the manual air relief assembly on select Hayward filters. If you have seepage around the air relief, difficulty holding a seal after opening/closing the air bleed, or worn/dry O-rings during service, replacing these O-rings helps restore a tight, leak-resistant seal.

Fits / Compatibility

  • Hayward Pro-Grid vertical grid D.E. filters (air relief assembly sealing)
  • Hayward SwimClear cartridge filters (air relief assembly sealing)
  • Hayward HCF series cartridge filters (air relief assembly sealing)
  • Commonly used with Hayward Manual Air Relief Assembly DEX2420MAR2 (verify your filter’s parts diagram)

What’s Included

  • (2) Replacement O-rings (air relief assembly seal kit)

Common Reasons to Replace

  • Drips or seepage around the manual air relief assembly
  • Air relief won’t seal reliably after operation
  • Flattened, cracked, swollen, or brittle O-rings discovered during filter service
  • Preventive replacement when servicing or rebuilding the air relief

Installation Notes

  • Shut off the pump and relieve filter pressure before servicing the air relief.
  • Remove the old O-rings, clean the grooves and mating surfaces, then install the new O-rings evenly.
  • Lightly lubricate with a silicone-based pool O-ring lubricant (never petroleum-based).
  • After reassembly, restart the system and verify the air relief seals with no drips.

Specs (Quick Reference)

  • Part Number: DEX2420Z8A
  • Part Type: Filter Parts (O-Ring Kit, Set of 2)
  • Pool Type: In-Ground
  • Warranty: 6 months (parts only)

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Maintenance Tips

  • Open the air relief at startup until a steady stream of water flows, then close—this helps purge trapped air safely.
  • Replace O-rings whenever they look flattened or dry; reusing worn O-rings is a common cause of repeat leaks.
  • Keep the air relief area clean—grit can nick O-rings and prevent a proper seal.
  • Never service the air relief or clamp while the filter is under pressure.
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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