Hayward CX250Z7 locking knob o-ring for Star Clear cartridge filter dome lidsHayward Star Clear Locking Knob O-Ring, CX250Z7 In stock$342
Hayward CX250Z7 locking knob o-ring for Star Clear cartridge filter dome lids
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Hayward Star Clear Locking Knob O-Ring, CX250Z7

Ask a questionMPN CX250Z7
$342
In stock
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Quick overview

  • Genuine Hayward part The factory CX250Z7 o-ring rather than a generic ring cut to fit.
  • Dome lid locking knob Seals at the locking knob that clamps the filter dome lid down.
  • Star Clear coverage Used on the C-250, C-500, C-750 and C-1000 cartridge filters.
  • Star-Clear II coverage Also used on the C800, C1100 and C1500 cartridge filters.
  • Small part, real leak A tired knob o-ring is a common source of a weeping filter lid.
  • Cheap insurance Worth replacing whenever the dome comes off for a cartridge clean.
Full description and specifications ↓

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Product details

Hayward CX250Z7 is the small o-ring that seals under the locking knob on a Star Clear or Star-Clear II cartridge filter dome lid. It is one of the parts that gets stretched and pinched every time the lid comes off for a cartridge clean, and one of the first places a filter starts to weep.

The same ring covers a wide span of the range. On the original Star Clear line it fits the C-250, C-500, C-750 and C-1000. On the Star-Clear II line it fits the C800, C1100 and C1500.

This is the genuine Hayward ring, so it seats at the right compression instead of squeezing out or leaving the knob loose. Wipe the groove clean, add a thin film of silicone based o-ring lubricant, and set the ring in dry hands before the knob goes back on.

Specifications
Brand Hayward
Manufacturer part number CX250Z7
UPC 610377004664
Part type Pool filter part
Type O-ring for dome lid locking knob
Fits Hayward Star Clear C-250, C-500, C-750, C-1000
Also fits Hayward Star-Clear II C800, C1100, C1500
Shipping weight 0.05 lb
Ships Parcel

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Questions and answers

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

Which o-ring is this?
The one at the dome lid locking knob, Hayward part CX250Z7. It is not the large tank body o-ring.
Will it fit my filter?
It fits the Star Clear C-250, C-500, C-750 and C-1000, and the Star-Clear II C800, C1100 and C1500.
Is this a genuine Hayward part?
Yes. This is the Hayward CX250Z7, not an aftermarket equivalent.
Should I lubricate it?
A thin film of pool grade silicone o-ring lubricant helps the ring seat and makes the next teardown easier. Petroleum grease will swell it.
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