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Use the Watts Flowmatic WW-FF water filter wrench for Watts number 10 Full-Flow Housings and Watts number 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. Overtightening the sump can cause damage to the O-rings and make reopening the housing sump difficult. You should only hand tighten the housing sump. The Watts WW-FF wrench makes replacing water filters easy.