Sta-Rite WC9-3 black tank o-ring for Posi-Flo II PTM cartridge filtersSta-Rite Black Tank O-Ring for Posi-Flo II PTM Cartridge Filters, WC9-3 In stock$4099
Sta-Rite WC9-3 black tank o-ring for Posi-Flo II PTM cartridge filters
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Sta-Rite Black Tank O-Ring for Posi-Flo II PTM Cartridge Filters, WC9-3

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$4099
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Quick overview

  • Sta-Rite WC9-3 The factory o-ring by part number, not a measured guess from a bulk drawer.
  • Posi-Flo II PTM series Fits the Posi-Flo II cartridge filter in the PTM series.
  • Also PTM 135 Listed for the Posi-Flo II PTM 135 series as well.
  • Separation tank too The same o-ring is used on the separation tank assembly.
  • Black Supplied in black.
  • Replace it while the tank is open An o-ring costs a fraction of the callback for a lid that seeps once the pump comes up to pressure.
Full description and specifications ↓

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Product details

The Sta-Rite WC9-3 is the black tank o-ring for the Posi-Flo II cartridge filter in the PTM series and the PTM 135 series, and for the separation tank assembly.

What it seals

This is the o-ring at the tank joint, the one that has to hold once the pump comes up to pressure. It lives in a groove, it takes a set from being compressed for years, and it dries out and nicks in service. A leak that starts right after a cartridge clean is almost always this ring going back in tired.

Fitting it

Clean the groove out completely before the new ring goes in, and use a silicone based lubricant made for pool o-rings. Petroleum grease will soften and swell the rubber, and the ring that was going to last several seasons will not.

Specifications
Brand Sta-Rite
Manufacturer part number WC9-3
UPC 788379853167
Type O-Ring
Color Black
Part type Pool filter part
Fits Posi-Flo II Cartridge Filter, PTM Series, Posi-Flo II Cartridge Filter, PTM 135 Series, Separation Tank Assembly
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 filters does this o-ring fit?
The Posi-Flo II cartridge filter in the PTM series and in the PTM 135 series, and the separation tank assembly.
Why is my filter lid leaking after I cleaned the cartridge?
The tank o-ring is the usual answer. It takes a set in the groove, and once it is flattened, nicked or dried out it will not seal again when the clamp goes back on.
Should I lubricate it?
Use a silicone based lubricant made for pool o-rings. Petroleum grease attacks the rubber and will shorten its life.
Is Sta-Rite the same as Pentair?
Sta-Rite is part of Pentair, and this part is listed under both names. Ordering by the WC9-3 number avoids the confusion.
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