Hayward ECX12866 Replacement Tank O-Ring for Perflex® DE Filters

Part # ECX12866 — a genuine Hayward replacement tank O-ring designed for Perflex® Extended-Cycle DE filter systems. This O-ring provides the primary seal between the upper and lower filter tank halves, ensuring a watertight and pressure-tight connection during operation.

Key Features

OEM Hayward tank O-ring engineered specifically for Perflex DE filter systems.
Forms a secure, leak-free seal between the filter tank halves.
Durable elastomer construction resists pool chemicals, pressure cycling, and outdoor exposure.
Ensures proper system pressure and prevents air intrusion that can reduce filtration efficiency.
Direct replacement part requiring no modification for installation.

Compatible Models

The ECX12866 O-ring is commonly used on Hayward Perflex DE filter models including:

EC40 Series
EC50 Series
EC65 / EC65A Series

Typical Applications

This tank O-ring should be replaced when the filter begins showing signs of leakage at the tank band clamp, difficulty holding pressure, or air bubbles returning to the pool. Replacing a worn or flattened O-ring restores proper sealing and helps maintain the filter’s designed performance.

Installation & Compatibility Notes

Turn off the pump and relieve all system pressure before servicing. Remove the tank clamp, separate the tank halves, and carefully extract the old O-ring. Clean the groove and sealing surfaces thoroughly. Apply a thin layer of pool-safe silicone lubricant to the new ECX12866 O-ring, seat it evenly in the groove, and reassemble the tank. Tighten the tank clamp per manufacturer guidelines and verify there are no leaks upon startup.

Why Choose This O-Ring?

This genuine Hayward ECX12866 gasket maintains the original performance and reliability of your Perflex DE filter. Using OEM seals helps prevent unexpected leaks, reduces maintenance issues, and ensures the system operates at proper pressure for optimal filtration.

Maintenance Tips

Inspect the tank O-ring at the start and end of each season for flattening, cracks, or chemical wear.
Always lubricate the O-ring with silicone-based lubricant to extend its lifespan and prevent pinching.
Check the tank clamp tension periodically to ensure an even, secure seal.
Replace the O-ring any time the tank is disassembled for cleaning or major service.

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.