Hayward CX900F filter head lid o-ring for Star Clear Plus cartridge filtersHayward Filter Head Lid O-Ring, CX900F In stock$4399
Hayward CX900F filter head lid o-ring for Star Clear Plus cartridge filters
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Hayward Filter Head Lid O-Ring, CX900F

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$4399
In stock
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Quick overview

  • Genuine Hayward Factory part CX900F, the correct section for the Star Clear Plus head.
  • Fits five filter sizes Star Clear Plus C751, C900, C1200, C1750 and C1900 cartridge filters.
  • Also listed for DE separation tanks Hayward carries the same ring under its Pro Grid DE separation tank DE-900 and DE-1100 parts.
  • Seals the filter head The ring sits between the lid and the body, so a hardened one is the usual reason a Star Clear Plus sprays at the top.
  • Change it at every cartridge clean The lid comes off to reach the element, which is the natural moment to fit a fresh ring.
  • Silicone lubricant only Petroleum grease swells the rubber and cuts the life of the seal.
Full description and specifications ↓

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Product details

The Hayward CX900F is the filter head lid o-ring for the Star Clear Plus cartridge filters: C751, C900, C1200, C1750 and C1900. It is the genuine Hayward part, and Hayward also carries it under the Pro Grid DE separation tank DE-900 and DE-1100 parts.

What it seals

An o-ring is a plain round gasket that squeezes between two faces to hold pressure. This one sits between the filter head and the body. When the filter is running, everything in the tank is under pump pressure, and this ring is what keeps it there.

Why it fails

Sun, chlorine and repeated compression harden the rubber and take the spring out of it. Once the ring has flattened it stops filling the groove, and the filter starts to seep or spray at the lid. Because the head has to come off to clean the cartridge, most owners fit a new ring during a routine element clean rather than waiting for the leak.

Fitting

Wipe the groove and the sealing face clean, seat the ring without stretching it, and use a silicone based o-ring lubricant. Petroleum grease swells the rubber and will shorten the life of the new seal.

Specifications
Brand Hayward
Manufacturer part number CX900F
UPC 610377209441
Type Filter head lid o-ring
Part type Pool filter part
Fits Hayward Star Clear Plus C751, C900, C1200, C1750, C1900 cartridge filters
Also listed under Hayward Pro Grid DE separation tank DE-900, DE-1100
Shipping weight 0.1 lb
Ships Parcel

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Questions and answers

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

Which filters take this o-ring?
The Hayward Star Clear Plus cartridge filters C751, C900, C1200, C1750 and C1900.
My filter sprays water from the lid. Is this the fix?
Usually. The lid o-ring hardens and flattens over time and stops sealing under pressure. Replace the ring first, then check the lid and the locking knob if the leak continues.
Is it a genuine Hayward part?
Yes. It is the Hayward OEM lid o-ring, part CX900F.
What lubricant should I use on it?
A silicone based o-ring lubricant. Petroleum grease attacks the rubber.
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