Step 66TH STEP
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Now that you have this removed you can remove the rubber "O" ring #5. NOTE: there are many different designs with different types of seals and "O" rings If you happen to get to this step and find a waxy rubbery cylendrical seal, FORGET IT. they are impossible to replace but you can buy the entire assembly that you removed from the faucet. When you have the parts just repeat these steps in reverse. BTW you might want to soak the parts you don't replace in some type of calcium and lime remover. Now wash your hands and get some dinner.