Pentair 411000 WhisperFlo XF pump union nutPentair WhisperFlo XF Union Nut, 411000 In stock$2399
Pentair 411000 WhisperFlo XF pump union nut
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Pentair WhisperFlo XF Union Nut, 411000

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$2399
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Quick overview

  • Genuine Pentair Factory part number 411000.
  • WhisperFlo XF The union nut for the WhisperFlo XF pump.
  • Nut only The collar on its own, not the union half or the o-ring.
  • Common failure Union nuts crack at the thread or seize on after years in the sun, and they are the cheapest part of the joint.
  • No replumbing Replacing the nut means unthreading a union rather than cutting pipe.
  • Hand tighten These collars seal on an o-ring and do not want a wrench, which is what cracks them in the first place.
Full description and specifications ↓

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Product details

Pentair 411000 is the union nut for the WhisperFlo XF pump, the threaded collar that draws the union half up against the pump port.

What it is

Every pump union is three pieces: the tail that solvent welds to the pipe, the o-ring that seals, and the nut that pulls the two faces together. The nut carries all the clamping load, and it is the piece that suffers. Years of sun make the plastic brittle, and one hard pull with a wrench splits it at the thread.

Replacing it

Shut the pump down, relieve pressure, unthread the old collar and fit the new one. It is a job that stays at the union: nothing gets cut and nothing gets glued. Inspect the o-ring while the joint is open, since it is the part that actually seals and it is worth changing at the same time. Take the new nut up hand tight only.

Specifications
Brand Pentair
Manufacturer part number 411000
UPC 788379807658
Type Union nut
Fits Pentair WhisperFlo XF pump
Shipping weight 0.3 lb
Ships Parcel

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Questions and answers

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

Does this include the union o-ring?
No. This is the union nut alone. The o-ring is a separate Pentair part.
Which pump is it for?
The Pentair WhisperFlo XF.
My union leaks. Is the nut the problem?
Check the o-ring first, since that is what seals. Replace the nut when it is cracked, when the threads are damaged or when it will no longer pull the joint up evenly.
Should I tighten it with a wrench?
No. A union collar seals on its o-ring and is meant to go up hand tight. Wrenching it is the usual reason one splits.
Ask your own question