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

Details

Brand
HAYWARD
Colour
Black
Material
Nitrile Rubber
Temperature Range
-4E+1 Degrees
UPC
610377209441

🧪Durable Buna-N nitrile rubber material

🌡️Operates from -40°C to withstand extremes

🛠️Precision fit for Hayward Star-Clear series

NT$3418

Duties & taxes included

In stock

Sold byAmazon TaiwanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal the deal with confidence—never let a leak cramp your poolside vibe!

TRUSTED BY THOUSANDS - Backed by 1,500+ glowing reviews and a 4.6-star rating, join the community that keeps their pools pristine.
SEAMLESS COMPATIBILITY - Engineered specifically for Hayward Star-Clear Plus filters ensuring a perfect, leak-proof seal every time.
EFFORTLESS INSTALLATION - Designed for a snug, tight fit that’s easy to replace—no leaks, no fuss, just reliable filtration.
PREMIUM BUNA N MATERIAL - Crafted from high-grade nitrile rubber for superior chemical resistance and long-lasting durability.
EXTREME TEMPERATURE RESILIENCE - Maintains integrity from -40°C, built to perform under harsh pool conditions without cracking or warping.

The Hayward CX900F Filter Head O-Ring is a high-quality replacement seal designed exclusively for Hayward Star-Clear Plus Cartridge Filter Series and Separation Tanks. Made from durable Buna-N nitrile rubber, it ensures a tight, leak-proof fit that withstands temperatures as low as -40°C. Lightweight and easy to install, this O-ring is trusted by thousands of pool owners for reliable, long-lasting performance.

Specifications

ASIN	B004UHGB8E
Brand Name	HAYWARD
Colour	Black
Customer Reviews	4.6 4.6 out of 5 stars (1,535)
Global Trade Identification Number	00610377209441
Item Type Name	filter
Item Weight	1.3 Ounces
Manufacturer	filter
Material Type	Nitrile Rubber
Model Number	CX900F
Number of Pieces	1
Part Number	CX900F
Temperature Range	-4E+1 Degrees Celsius
UPC	610377209441 799331488112 788660888120
Unit Count	1.00 Count

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