American Plumber, Culligan, Pentek SW-1 Slim Line Housing Wrench

Use the SW-1 wrench to loosen bottom of housing during cartridge replacement. Slide circular end over housing until a snug fit is achieved and unscrew. The SW-1 makes changing water filters easy. The SW-1 spanner wrench can be used with Slim-Line and 3G housings. DO NOT use the SW-1 wrench to tighten the bottom of the housing. Only hand-tighten the bottom of the housing onto the cap to prevent cracking. The SW-1 wrench is approximately 4.25 Inches Wide. Width is slightly less at the notches.