Pentair 39300600 locking lid o-ring for the Ultra Flo pumpPentair Locking Lid O-Ring for Ultra Flo Pump, 39300600 In stock$499
Pentair 39300600 locking lid o-ring for the Ultra Flo pump
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Pentair Locking Lid O-Ring for Ultra Flo Pump, 39300600

Ask a questionMPN 39300600
$499
In stock
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Quick overview

  • Exact size 6-1/2 in. inside diameter with a 1/4 in. cross section.
  • For pumps after 11/94 This is the lid o-ring for Ultra Flo pumps built after November 1994.
  • Earlier pumps take a different ring Ultra Flo pumps built before 11/94 use Pentair 39300300 instead.
  • Seals the locking lid Sits under the lid so the pump holds prime instead of drawing air at the seal.
  • Rubber construction Molded rubber, the same material as the ring the pump left the factory with.
  • Genuine Pentair Factory part 39300600 for the American Products Ultra Flo pump.
Full description and specifications ↓

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Product details

The Pentair 39300600 is the locking lid o-ring for the American Products Ultra Flo pump. It measures 6-1/2 in. across the inside with a 1/4 in. cross section, and it is molded in rubber, the same as the original.

Check your build date first

Pentair changed the lid on this pump in late 1994. This ring is for Ultra Flo pumps built after 11/94. Pumps built before that date take Pentair 39300300, which is a different size, so confirm which side of the change your pump falls on before ordering.

What it does

The o-ring seals the locking lid to the pump body. On the suction side of the system that seal is under vacuum, so when the ring hardens, flattens or cracks the pump starts drawing air instead of water. The usual symptoms are a pump that will not hold prime and air collecting in the strainer basket. Wipe the groove clean, fit the new ring, and use a silicone o-ring lubricant to help it seat.

Specifications
Brand Pentair
Manufacturer part number 39300600
UPC 788379699277
Type Locking lid o-ring
Part type Pool pump part
Material Rubber
Inside diameter 6-1/2 in.
Cross section 1/4 in.
Fits Pentair American Products Ultra Flo pumps built after 11/94
Earlier version Pentair 39300300 for pumps built before 11/94
Also listed under Pentair American Products Eclipse and Meteor top mount filter parts
Shipping weight 0.02 lb
Ships Parcel

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Questions and answers

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

How do I know which o-ring my Ultra Flo takes?
Pumps built after 11/94 use this ring, Pentair 39300600. Pumps built before 11/94 use Pentair 39300300, so check the build date before ordering.
What size is it?
6-1/2 in. inside diameter with a 1/4 in. cross section.
Why is my pump losing prime?
A lid o-ring that has hardened or taken a set lets the pump pull air at the lid, which shows up as loss of prime and air sitting in the basket. A fresh ring is the first thing to try.
Should I lubricate the new o-ring?
A silicone based o-ring lubricant helps the ring seat evenly and makes the lid easier to break loose next time. Keep petroleum based grease away from pool rubber.
Ask your own question