Sta-Rite 24850-0008Z 21 in. filter tank o-ring for System 3 filtersSta-Rite 21 in. Filter Tank O-Ring, System 3, 24850-0008Z In stock$7299
Sta-Rite 24850-0008Z 21 in. filter tank o-ring for System 3 filters
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Sta-Rite 21 in. Filter Tank O-Ring, System 3, 24850-0008Z

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$7299
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Quick overview

  • Genuine Sta-Rite Part number 24850-0008Z, a Pentair part for the System 3 line.
  • For the 21 in. tank Fits System 3 filters built on the 21 in. tank, including the S7S50 and S8S70 sand filters.
  • Check your tank size The 25 in. System 3 tank, such as the S8D110, takes a different o-ring.
  • Seals the tank Sits between the tank halves so the filter holds pressure without weeping at the seam.
  • Replace when it weeps A drip at the tank seam after reassembly means the ring is flattened or nicked.
  • UPC 788379828738.
Full description and specifications ↓

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Product details

The Sta-Rite 24850-0008Z is the tank o-ring for System 3 filters with the 21 in. tank. It is a Pentair part, and it fits the S7S50 and S8S70 sand filters among others in the System 3 family built on that tank.

Check your tank size first

System 3 filters come in more than one tank size. The 25 in. tank, used on the S8D110, takes a different o-ring. If you are not sure which you have, measure across the tank at the seam.

Fitting

Clean the groove, lightly lubricate the new ring with a silicone o-ring lubricant, seat it and bring the tank halves together evenly. A drip at the seam after reassembly usually means the ring was pinched or the groove was not clean.

Specifications
Brand Sta-Rite
Manufacturer part number 24850-0008Z
UPC 788379828738
Type Filter tank o-ring
Tank size 21 in.
Fits Sta-Rite System 3 filters with a 21 in. tank, including S7S50 and S8S70 sand filters
Larger size 25 in. tank o-ring for the S8D110 is a separate part
Shipping weight 0.65 lb
Ships Parcel

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Questions and answers

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

Which System 3 filters use this o-ring?
System 3 filters with the 21 in. tank. The S7S50 and S8S70 sand filters are the common ones.
My filter is an S8D110. Is this the right ring?
No. The S8D110 has the 25 in. tank and takes the 25 in. tank o-ring, which is a separate part.
Why is the tank seam leaking after I cleaned the filter?
The tank o-ring is flattened, nicked or was not seated when the halves went back together. Clean the groove, lubricate the new ring lightly and reassemble evenly.
Is it Sta-Rite or Pentair?
Both. Sta-Rite is a Pentair brand, and the part is listed under Pentair part number 24850-0008Z.
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