Pentair 350103 o-ring for OptiFlo pool pumpsPentair O-Ring for OptiFlo Pumps, 350103 In stock$1099
Pentair 350103 o-ring for OptiFlo pool pumps
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Pentair O-Ring for OptiFlo Pumps, 350103

Ask a questionMPN 350103
$1099
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Quick overview

  • Genuine Pentair part Factory part number 350103, sized for the OptiFlo pump body.
  • For the OptiFlo range Listed with the OptiFlo pump parts covering 3/4 through 1-1/2 HP.
  • Seals the pot to the volute The source lists this as the pot to volute o-ring, the joint between the strainer pot and the pump housing.
  • Air leaks start here A flat or nicked o-ring at this joint lets the pump draw air, and the pump loses prime.
  • Replace it whenever the pump is opened An o-ring that has been compressed for seasons will not seal reliably a second time.
  • Lubricate before fitting A thin film of pool rated silicone o-ring lubricant helps it seat without rolling or pinching.
Full description and specifications ↓

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Product details

The Pentair 350103 is the o-ring for the OptiFlo pool pump, listed with the parts for the 3/4 through 1-1/2 HP models. It is the genuine Pentair part.

Where it sits

The source lists this as the pot to volute o-ring, the seal at the joint where the strainer pot meets the pump volute. It is on the suction side of the pump, which is why it matters more than its price suggests.

What a bad one does

Anything upstream of the impeller that leaks does not drip, it draws air. A flattened, nicked or twisted o-ring at this joint lets air into the suction side, and the symptoms are a pump that will not hold prime, a strainer pot that never fills completely and air bubbling out of the returns.

Fitting

Clean the groove and the mating face before fitting, and use a thin film of silicone o-ring lubricant rated for pool use. Avoid petroleum based grease, which swells the rubber over time. Any time the pump is opened, fit a new o-ring rather than reusing the one that has been compressed in the groove for seasons.

Specifications
Brand Pentair
Manufacturer part number 350103
UPC 788379775254
Type Pool pump part, o-ring
Fits Pentair OptiFlo pump, 3/4 to 1-1/2 HP
Position Pot to volute
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 pumps does this o-ring fit?
It is listed with the Pentair OptiFlo pump parts covering the 3/4 through 1-1/2 HP models.
Where does it sit in the pump?
The source describes it as the pot to volute o-ring, the seal between the strainer pot and the pump volute.
Do I need lubricant?
A thin film of silicone o-ring lubricant made for pool use helps the o-ring seat evenly and come apart cleanly next time. Do not use petroleum grease, which swells the rubber.
Should I replace it while the pump is apart?
Yes. Once an o-ring has spent seasons compressed in a groove it takes a set, and refitting the old one is the usual reason a rebuilt pump still leaks air.
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