Pentair 178575Z bottom bulkhead for Quad D.E. and FNS Plus filtersPentair Bottom Bulkhead for Quad DE and FNS Plus Filters, 178575Z In stock$3299
Pentair 178575Z bottom bulkhead for Quad D.E. and FNS Plus filters
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Pentair Bottom Bulkhead for Quad DE and FNS Plus Filters, 178575Z

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$3299
In stock
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Quick overview

  • Genuine Pentair Factory part 178575Z, not an aftermarket fitting.
  • Quad D.E. filters Pentair lists it as the bottom bulkhead for the Quad D.E. filter.
  • FNS Plus The product title also lists it for FNS Plus filters, so it covers both families.
  • Base of the tank The bulkhead is the fitting at the bottom of the filter, where the tank meets its plumbing.
  • Stops a base leak Weeping at the bottom of a DE filter often traces back to the bulkhead rather than the tank itself.
  • Serviceable part Replaced on its own, without buying a whole tank bottom assembly.
Full description and specifications ↓

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Product details

The Pentair 178575Z is the bottom bulkhead for the Quad D.E. filter. The product title also lists it for FNS Plus filters, so it turns up under both families; check the model plate on your tank before ordering.

What it does

The bulkhead is the fitting at the base of the filter tank where the tank passes through to its plumbing. It carries the full pressure of the system and is sealed against the tank, which makes it one of the first places to look when a DE filter starts weeping low down.

Replacing it

The bulkhead is a serviceable part in its own right, so a base leak does not automatically mean a new tank. If the tank body itself is cracked or distorted, the complete tank bottom assembly is the larger repair, but a failed bulkhead is fixed with this part alone.

Specifications
Brand Pentair
Manufacturer part number 178575Z
UPC 788379671525
Type Bottom bulkhead
Fits Pentair Quad D.E. filters
Also listed for FNS Plus filters
Position Bottom of the filter tank
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.

Which filters does this fit?
Pentair sources list it as the bottom bulkhead for the Quad D.E. filter, and the product title also names the FNS Plus filters. Check the model plate on your tank before ordering.
Where does the bulkhead sit?
At the base of the filter tank, where the tank connects through to its plumbing.
My filter is weeping at the bottom. Is this the part?
Often, yes. A leak at the base of a DE filter is more likely to be the bulkhead or its seal than a failed tank.
Do I need to buy the whole tank bottom?
Not necessarily. The bulkhead is a separate serviceable part, though the complete tank bottom assembly is available if the tank itself is damaged.
Ask your own question