Hayward CX120D filter lid o-ring for the Micro-Star cartridge filterHayward O-Ring for Micro Star-Clear Filter Lid, CX120D In stock$2399
Hayward CX120D filter lid o-ring for the Micro-Star cartridge filter
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Hayward O-Ring for Micro Star-Clear Filter Lid, CX120D

Ask a questionMPN CX120D
$2399
In stock
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Quick overview

  • Genuine Hayward The factory o-ring, part CX120D.
  • Micro-Star cartridge filter Listed for use with the Hayward Micro-Star cartridge filter.
  • Listed at 5-7/8 in. ID, 3/16 in. Check both figures against the ring you are taking out.
  • Seals the lid This o-ring is what holds the filter lid watertight while the pump is running.
  • Lubricate on assembly A silicone based o-ring lubricant helps it seat evenly and stops it pinching as the lid comes down.
  • Replace rather than stretch An o-ring that has flattened or taken a set will not reseal, and tightening the lid harder damages the lid instead.
Full description and specifications ↓

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Product details

The Hayward CX120D is the filter lid o-ring for the Micro-Star cartridge filter. It is listed at 5-7/8 in. ID, 3/16 in., and it is the seal between the lid and the filter body.

The part that stops the lid leaking

Everything above the o-ring is under pump pressure the whole time the system runs. When the ring is fresh it fills its groove and seals with very little clamping force. When it has flattened, cracked or taken a permanent set, it stops sealing, and no amount of extra clamping brings it back. Cranking the lid down to chase a drip is how lids get cracked.

Fitting it

Clean the groove and the sealing face before the new ring goes in, then give it a thin film of silicone based o-ring lubricant. That helps it seat evenly and keeps it from rolling or pinching as the lid comes down. Use silicone rather than a petroleum grease, which swells the rubber over time.

Before you order

Measure the old ring against the 5-7/8 in. ID and 3/16 in. figures listed here. Cartridge filters in the same range are not all built on the same o-ring, so the measurement settles it faster than the model name does.

Specifications
Brand Hayward
Manufacturer part number CX120D
UPC 610377004138
Type Filter lid o-ring
Dimensions 5-7/8 in. ID, 3/16 in.
Part type Pool filter part
Fits Hayward Micro-Star cartridge filter
Shipping weight 0.06 lb
Ships Parcel

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Questions and answers

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

What size is it?
It is listed as 5-7/8 in. ID and 3/16 in. Measure the ring you are replacing against both figures before ordering.
Which filter does it fit?
The Hayward Micro-Star cartridge filter, where it seals the lid to the body.
Should I grease it?
Yes, a thin film of silicone based o-ring lubricant. It helps the ring seat evenly in its groove and keeps it from pinching or rolling as the lid goes down. Avoid petroleum grease, which swells the rubber.
My filter lid is leaking, is the o-ring the fix?
Usually. An o-ring that has flattened, cracked or taken a permanent set will not reseal no matter how hard the lid is clamped, and overtightening to chase the leak cracks the lid rather than stopping the drip.
Ask your own question