SuperPro O-39-9 universal o-ring, 1/2 inch inside diameterSuperPro Universal O-Ring 1/2" ID, O-39-9 In stock$699
SuperPro O-39-9 universal o-ring, 1/2 inch inside diameter

SuperPro Universal O-Ring 1/2" ID, O-39-9

Ask a questionMPN O-39-9
$699
In stock

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Quick overview

  • Universal size A generic o-ring rather than a single model part, so one size covers drain plugs and a range of small fittings.
  • Measured size 1/2 inch inside diameter with a 3/32 inch cross section, the two numbers to check against the ring you are replacing.
  • Wide cross reference Sold under P40, O-39-9 and U9-359, and it carries a long list of substitute numbers from other suppliers.
  • Common failure point A flattened or cracked drain plug o-ring is one of the most frequent causes of a small persistent leak at the pad.
  • Buy a spare Cheap enough to keep on the shelf, and the part most likely to be missing when a plug goes back in mid season.
  • Use silicone lube Silicone based lubricant is the correct dressing for pool o-rings, petroleum grease swells and breaks rubber down.
Full description and specifications ↓

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Product details

The SuperPro O-39-9 is a universal o-ring with a 1/2 inch inside diameter and a 3/32 inch cross section. It is not tied to one piece of equipment, it is a stock size that shows up on drain plugs and small fittings across pumps, filters and booster pumps.

Buying by measurement, not by model

Because this is a generic size, the right way to order it is to measure. Take the inside diameter of the old ring across the hole, then the thickness of the rubber. If those come to 1/2 inch and 3/32 inch, this is the ring. The same part is cataloged as P40, O-39-9 and U9-359, and a long list of substitute numbers from other suppliers points at the same size.

Fitting it

Clean the groove before the new ring goes in, and dress it with a silicone based o-ring lubricant. Petroleum grease is the common mistake here, it swells the rubber and shortens the life of the ring. A drain plug that has started weeping is usually the ring rather than the plug, so this is worth trying before replacing anything larger.

Specifications
Brand SuperPro
Manufacturer part number O-39-9
Manufacturer part numbers P40, O-39-9, U9-359
UPC 601402111785
Type Universal o-ring
Inside diameter 1/2"
Cross section 3/32"
Substitute part numbers 47011200, 171051005, 205104, 3081001, LLE45, 1137, 1269009, 29113, 8050111, P62112, 273011, 11206, 8050112, 201010, 192115, U9359, 510031, U9158, 6020006, 47011200R, 39960148, LE45, 017437, 3262-08, 90-423-5112, POL-201-3293
Shipping weight 0.02 lb
Ships Parcel

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Customer reviews

Questions and answers

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

What size is this o-ring?
1/2 inch inside diameter with a 3/32 inch cross section. Measure the ring you are replacing across the inside of the circle, then measure the thickness of the rubber itself.
Is this made for one specific pump or filter?
No. It is a generic size that turns up in the parts breakdowns for a wide range of pumps, filters and booster pumps. Match it on measurement rather than on model name.
Why are there so many part numbers listed?
The same size ring is cataloged by several suppliers under their own numbers. P40, O-39-9 and U9-359 are the manufacturer numbers, and the substitute list covers the other numbers it is sold under.
Should I grease it before fitting?
Use a silicone based o-ring lubricant. Petroleum based grease causes the rubber to swell and break down, which shortens the life of the ring and can make the leak worse.
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