Hayward CX900H Star Clear Plus locking knob o-ringHayward StarClear Plus Knob O-Ring, CX900H In stock$399
Hayward CX900H Star Clear Plus locking knob o-ring
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Hayward StarClear Plus Knob O-Ring, CX900H

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$399
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Quick overview

  • Genuine Hayward The factory CX900H o-ring, not a generic ring cut to size.
  • Locking knob seal Seals at the Star Clear Plus locking knob.
  • Five filter models Fits the Hayward C751, C900, C1200, C1750 and C1900 cartridge filters.
  • Rubber Made in rubber, as Hayward specifies for this position.
  • Cheap fix first An o-ring is the first thing to change when the knob area weeps, before suspecting the filter body.
  • Keep a spare Small seals like this are worth having on the shelf before opening the filter for a cleaning.
Full description and specifications ↓

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Product details

The Hayward StarClear Plus Knob O-Ring, CX900H, is the rubber o-ring for the locking knob on Hayward StarClear Plus cartridge filters. It is the Brand OEM Hayward part, and Hayward's StarClear Plus owner's manual lists it as one o-ring per filter on the C751, C900, C1200 and C1750 models.

What it fits

The manual covers the C751, C900, C1200 and C1750, the last two listed there as C1200(2) and C17502. This listing also names the C1900. Each filter takes one CX900H at the locking knob.

Not the head o-ring

CX900H seals the locking knob only. The seal between the filter head and the tank is a different part, the filter head o-ring CX900F, and the cartridge guide is CX900D. Hayward lists them as separate parts, so order by number.

When to change it

Rubber hardens and takes a set, and once it does the knob area starts to weep. The o-ring costs almost nothing, so it is the sensible first thing to replace, and a good part to have on hand before you open the filter to clean the cartridge.

Specifications
Brand Hayward
Manufacturer part number CX900H
UPC 610377209298
Part type Pool Filter Part
Type Locking knob o-ring
Material Rubber
Fits Hayward Star Clear Plus C751, C900, C1200, C1750, C1900
Related parts CX900F filter head o-ring and CX900D element guide are separate Hayward parts
Shipping weight 0.02 lb
Ships Parcel

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Questions and answers

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

Which filters does it fit?
Hayward Star Clear Plus cartridge filters: C751, C900, C1200, C1750 and C1900.
Where does this o-ring sit?
At the Star Clear Plus locking knob.
Is it genuine Hayward?
Yes. It is Hayward part CX900H.
What is it made of?
Rubber.
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