Product Overview

The Pentair 178575 Bottom Bulkhead is a genuine Pentair replacement bulkhead fitting for the bottom of the filter tank on Pentair Quad D.E. filters. It is replaced when the original bulkhead fitting is cracked, leaking or damaged.

Ideal For

Repairing a leak at the bottom bulkhead of a Pentair Quad D.E. filter tank

Service technicians rebuilding Quad D.E. filters

Key Features

Genuine Pentair OEM part: direct replacement under part number 178575.

Bottom tank bulkhead: replaces the bulkhead fitting at the base of the filter tank.

Specifications

Warranty & Compatibility

Compatibility Notes

Pentair lists this bottom bulkhead for Quad D.E. filters. Other Pentair cartridge filters use different bottom bulkhead parts, so confirm your filter model and the part number in its parts list before ordering.

Installation Notes

Turn off the pump, close any isolation valves and drain the filter before servicing. Remove the old bulkhead, clean the sealing surfaces and install the new bulkhead with its gasket or O-ring seated correctly. Refill and check for leaks before returning the system to normal operation. Follow the Pentair filter manual for your model.

Customer-Facing Q&A

Q: What is the part number?
A: The Pentair part number is 178575.

Q: What filters does it fit?
A: It is listed for Pentair Quad D.E. filters. Check your filter's parts list to confirm.

Q: When should it be replaced?
A: Replace it if the bottom bulkhead is cracked, leaking or no longer seals.