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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💦 Keep Your Pool Crystal Clear with Confidence!

💧 ENHANCED FILTRATION - Ensures optimal performance and longevity of your filtration system.
⚖️ LIGHTWEIGHT DESIGN - Weighs only 5.5 pounds, making handling and installation a breeze.
🔒 DURABLE CONSTRUCTION - Built to withstand the rigors of pool maintenance, ensuring a long-lasting seal.
🔄 SEAMLESS COMPATIBILITY - Designed specifically for Hayward Star-Clear Plus cartridge filter series and separation tank.
🔧 EFFORTLESS INSTALLATION - Quick and easy replacement to keep your filtration system running smoothly.

The Hayward CX900F Filter Head O-Ring Replacement is a lightweight, durable solution designed for seamless compatibility with Hayward Star-Clear Plus cartridge filter series and separation tanks, ensuring optimal filtration performance.

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