The Pentek 151120 / American Plumber W34-OR O-Ring is a replacement o-ring for all Pentek and American Plumber 3/4 inch I/O Filter Housings except the WH34 Housing.
The PSCL wrench for this model is part number SW-2:
The American Plumber WW34 SW-2 Filter Wrench makes changing your water filter easy. The WW34 filter wrench is made for 3/4 inlet/outlet housings and works with housing model numbers: 150015, 150111, HF-150, HF-160, HF-360, Ace 45025, Ace 46764, 1.