Pentair 152516Z Triton II buttress thread closure o-ringPentair Triton II Buttress Thread Closure O-Ring, 152516Z In stock$1199
Pentair 152516Z Triton II buttress thread closure o-ring
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Pentair Triton II Buttress Thread Closure O-Ring, 152516Z

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$1199
In stock
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Quick overview

  • Genuine Pentair Factory part 152516Z, also listed as 152516.
  • Triton II specific The closure o-ring for Pentair Triton II side mount sand filters.
  • Buttress thread closure Seals the threaded closure where it meets the tank.
  • Stops a weeping lid An o-ring that has hardened or taken a set is the usual reason a closure drips.
  • Cheap insurance A small part next to the cost of a tank, and easy to replace while the closure is off.
  • Lubricate on install A thin coat of silicone o-ring lubricant helps it seat and lengthens its life.
Full description and specifications ↓

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Product details

The Pentair 152516Z is the buttress thread closure o-ring for Triton II side mount sand filters. It is the genuine Pentair part and is also listed as 152516.

Where it sits

The closure threads into the top of the Triton II tank, and this ring is what seals it. A buttress thread carries load in one direction, which suits a pressure vessel, but the thread does not make the seal on its own. That job belongs to the o-ring.

When to replace it

Rubber hardens, flattens and takes a set. Once it does, the closure starts to weep under pressure no matter how firmly it is tightened. Clean the groove and the sealing face, fit a fresh ring with a light coat of silicone o-ring lubricant, and the leak goes away.

Specifications
Brand Pentair
Manufacturer part number 152516Z
Alternate part number 152516
UPC 788379880309
Type Buttress thread closure o-ring
Part type Pool filter part
Fits Pentair Triton II side mount sand filters
Shipping weight 0.19 lb
Ships Parcel

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Questions and answers

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

Which filters use this o-ring?
Pentair Triton II side mount sand filters.
Is 152516 the same part as 152516Z?
Yes. The two numbers refer to the same Pentair o-ring.
Why is my closure leaking?
The o-ring flattens and hardens with age and stops filling the groove. Replacing it is the first step, and cleaning the groove and sealing face before the new ring goes in matters as much as the ring itself.
Should I lubricate it?
Yes. A light coat of silicone based o-ring lubricant helps the ring seat evenly and keeps it from pinching as the closure is tightened.
Ask your own question