Use for twisting off the sump or canister on many GE single stage filter systems, dual stage filter systems, and reverse osmosis filter systems. Do NOT use the GE WX5X140 to tighten the water filter housing sump. 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 GE WX5X140 wrench makes replacing water filters easy.