WATTS WATTS-WW-FF Wrench for Full-Flow Clear Housings Makes replacing water filters easy Use the Watts Flowmatic WW-FF water filter wrench for Watts 10 Full-Flow Housings and Watts 20 Full-Flow Housings Use the Watts Flomatic wrench on the Watts W10FFPH1CBPR Clear Housing and the Watts W20FFPH1CBPR Clear Housing Do not use the Watts WW-FF spanner wrench to tighten the housing sumps Genuine OEM Product