When you install the O ring do you need to lubricate it? If so, what do you recommend?

I used a silicone lubricant on the O ring to make it easier to lock the cover. With the silicone the cover slides down onto the filter body. If you don't use it the ring may slide out of its groove and you will have cover that's not sealed, so,yes, use the silicone

What is the material of this o-ring?

The material for the o-ring is Black flexible rubber. Mine is holding up really well and fits perfectly.

Does this fit a hayward de 4800

Not sure what a Hayward de4800 is but this particular O-ring fits my Hayward cx90 and is about 10” in diameter. Hope this helps

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Hayward CX900F Filter Head O-Ring Replacement for Hayward Star-Clear Plus Cartridge Filter Series and Separation Tank

Product ID: 367070929

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Details

Brand
Hayward
Color
Black
Manufacturer
Hayward
Material
Metal
UPC
610377209441

📏Perfect Fit for C900/C1200/C1750

🔧Durable Buna-N Material

🇺🇸Proudly Made in USA

Description

💧 Keep Your Pool Crystal Clear with Confidence!

USA QUALITY - Crafted in the USA for unmatched reliability.
SEAL THE DEAL - Engineered for a leak-proof performance.
EASY INSTALLATION - Quick and hassle-free setup for your pool system.
LONG LASTING DURABILITY - Constructed from high-quality nitrile rubber.
VERSATILE COMPATIBILITY - Fits Hayward Star-Clear Plus models seamlessly.

The Hayward CX900F Filter Head O-Ring Replacement is designed specifically for the Hayward Star-Clear Plus Cartridge Filter Series, ensuring a perfect seal and optimal performance. Made from durable Buna-N material, this O-ring guarantees longevity and reliability, making it an essential component for maintaining your pool's filtration system.

Specifications

Manufacturer	filter
Country of Origin	USA
Item model number	CX900F

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