The Pentek SW-4 Filter Wrench fits the following housings with 1 inch and 1 1/2 inch inlet/outlets:
- American Plumber HD
- WWHC 20 inch
This Pentek, Ametek, US Filter, American Plumber wrench is known as part number 144368. Also known as 20 inch Big Blue 5 7/8 inch Filter Housing Wrench.