I irrefutably give this magnificent RO wrench a well-earned "5 stars rating! The FH-WWH Universal Half Filter RO Wrench is the "one wrench fits all" Cadillac of wrenches. It securely fits any section of the housing, and is less prone to stress breakage. For those "hard to open" filter housings, I recommend using the Watts "FH-WWH" in conjunction with the "FH-WWF" full circle wrench, for extra torque leverage.
Reviewed by: Ronnie from San Antonio, TX.