The wrench works with iSpring WGB32B series, WGB22B series, and WGB21B series Whole House Water Filters. Please reach out to us first before buying this wrench to use on other products. Tighten and Loosen with Ease: The wrench is made of solid plastic and contains 4 teeth that enable a firm grab. Peace of Mind Customer Service: Register online to activate your manufacturer warranty and life-time free tech support. We stand behind our products and if you encounter any problems with any of our products please reach out to us immediately. We are happy to help! Please note: The wrench is for whole house filter housings only and does not fit RO housings. If you need a wrench for reverse osmosis systems, please consider iSpring AWR1 (for RO membrane housings), AWR2 (for RO pre-filter housings), or AWR5N1 (for both).