Pentair 154412 internal bulkhead locknut, 2 inchPentair Genuine OEM 2" Internal Bulkhead Locknut, 154412 In stock$1599
Pentair 154412 internal bulkhead locknut, 2 inch
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Pentair Genuine OEM 2" Internal Bulkhead Locknut, 154412

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$1599
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Quick overview

  • Genuine Pentair The factory 154412 internal locknut, not a hardware store substitute.
  • 2 inch bulkhead Sized for the 2 inch bulkhead fitting on the filter tank.
  • Wide fitment Listed for Nautilus and Nautilus Plus DE filters, SM and SMBW 4000 Series filters, FNS filters and Triton II.
  • Plastic construction Molded plastic, the same material as the original so it tightens against the tank the way it should.
  • Internal side This is the internal locknut. The external spacer and the bulkhead gasket are separate parts.
  • Cheap fix for a leak A cracked or stripped locknut is a common source of a weep at the bulkhead.
Full description and specifications ↓

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Product details

The Pentair 154412 is the internal bulkhead locknut in 2 inch. It is the plastic nut on the inside of the filter tank that clamps the bulkhead fitting in place, and it is the genuine Pentair part.

Where it is used

Pentair lists it for the Nautilus and Nautilus Plus DE filters, the SM and SMBW 4000 Series filters, FNS filters and the Triton II. It is a shared part across a wide run of tanks, which is why it turns up so often on a service call.

Before you rebuild the bulkhead

The locknut works with a bulkhead gasket and an external spacer, both separate parts. If the bulkhead has been leaking, replace the gasket at the same time rather than reusing a flattened one. A bulkhead wrench is worth having for a tank that has not been opened in years.

Specifications
Brand Pentair
Manufacturer part number 154412
UPC 788379668846
Type Internal bulkhead locknut
Size 2 inch
Material Plastic
Part type Pool filter part
Fits Nautilus and Nautilus Plus DE pool filters, SM and SMBW 4000 Series filters, FNS filters, Triton II
Shipping weight 0.1 lb
Ships Parcel

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Questions and answers

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

What size is it?
2 inch. It is the internal locknut for the 2 inch bulkhead fitting.
Which filters does it fit?
It is listed for the Nautilus and Nautilus Plus DE filters, the SM and SMBW 4000 Series, FNS filters and the Triton II.
Is the gasket included?
No. The bulkhead gasket and the external spacer are separate Pentair parts, and it is worth replacing the gasket while the bulkhead is apart.
Do I need a special tool?
A bulkhead wrench makes the job much easier on a tank that has been together for years. It is sold separately.
Ask your own question