Hayward CX800F 9-1/2 inch filter head o-ring for Star-Clear II filtersHayward OEM O-Ring for Filter Head, CX800F In stock$4999
Hayward CX800F 9-1/2 inch filter head o-ring for Star-Clear II filters
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Hayward OEM O-Ring for Filter Head, CX800F

Ask a questionMPN CX800F
$4999
In stock
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Quick overview

  • Genuine Hayward Factory OEM part CX800F, the same seal fitted at the plant.
  • 9-1/2 inch diameter The large lid seal for the Star-Clear II filter head.
  • Fits three models Star-Clear II C800, C1100 and C1500 cartridge filters.
  • Stops the lid leaking The first part to change when water weeps from the seam between head and body.
  • Change it with the cartridge The seal comes off every time the filter is opened, so replace it while the housing is already apart.
  • Barcoded for ordering Carries UPC 610377005708 to confirm the right seal.
Full description and specifications ↓

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Product details

The Hayward CX800F is the filter head o-ring for the Star-Clear II cartridge filter, in the C800, C1100 and C1500 sizes. It measures 9-1/2 inches in diameter and is a genuine Hayward part.

Where it sits

This is the large seal on the joint between the filter head and the filter body. It has to hold that whole seam against system pressure, which is why a tired one shows up as a steady weep or spray right at the split line.

Replace it with the cartridge

The seal is disturbed every time the filter comes apart. It stretches, takes a set in the groove, and eventually stops sealing on reassembly. Since the housing is already open when you service the cartridge, that is the moment to put a fresh o-ring in rather than reuse the old one and open it all up again.

Fitting

Clean the groove and the mating face before the new seal goes in, and use a lubricant intended for pool o-rings. Petroleum products attack the rubber and shorten its life.

Specifications
Brand Hayward
Manufacturer part number CX800F
UPC 610377005708
Type Filter head o-ring
Diameter 9-1/2"
Fits Hayward Star-Clear II C800, C1100 and C1500 cartridge filters
Part type Pool filter part
Condition Genuine OEM
Shipping weight 0.2 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

Which filters does this seal fit?
Hayward Star-Clear II cartridge filters, models C800, C1100 and C1500.
How big is it?
9-1/2 inches in diameter. It is the large seal between the filter head and the body, not a small drain or gauge o-ring.
When should I replace it?
Any time the filter leaks at the seam between head and body, and as routine maintenance whenever you have the housing open to change the cartridge.
Should I lubricate it?
O-ring lubricant made for pool equipment helps the seal seat and makes the next teardown easier. Do not use petroleum grease on it.
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