Review on Superb Wrench SPBW 1 Housing Diameter by Michael Weaver

Plastic keys are useless unless you buy 2-3 and glue them together. Another option was a large (really large) pair of pliers that would damage the case anyway. Should have bought this heavy duty metal wrench for the SPBW-1 water filter housing years ago. If you don't want to ruin the filter housing, just put tape on the inside corners. My filter housings are already slightly dented from using these large pliers, so a few more marks won't make a difference. The SPBW-1 Heavy Duty Metal Water Filter Housing Wrench really makes removing the filter housings that much easier. It's long enough to get a good shoulder and since it's metal it will last a long time.