Use with #20 Pentek Big Blue Housings.
Use the SW-4 filter wrench only for twisting off water filter housing canisters.
Use the SW-4 wrench to loosen the bottom of the housing during water filter cartridge replacement. Slide circular end over the 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 water filter wrench makes changing water filters easy.
The SW-4 spanner wrench can be used with #20 Big Blue whole house housings.
The SW-4 wrench is approximately 6 Inches Wide. (Note: Width is slightly less at the notches.)