Use the SW-4 filter housing wrench only for twisting off water filter housing sumps.
Use the SW-4 wrench to loosen the bottom of the housing during cartridge replacement. Slide circular end over housing until a snug fit is achieved and unscrew.
Do NOT use the SW-4 housing wrench to secure the water filter canister to the water filter lid. You may damage the o-ring by securing the water filter lid too tight.
The SW-4 wrench makes changing water filters easy.
The SW-4 spanner wrench can be used with #20 Big Blue heavy duty whole house water filter housings.
Use SW-4 Wrench With:
Use with #20 Big Blue Whole House Water Filter Housings