This replacement part was incredibly easy to install. When I bought the part the GP30420 o-ring kit was "recommended" as a matching item for the GP77548 so I bought that too. However, this o-ring set is designed for kitchen faucets, not bathroom faucets. I see the o-ring kit description has since been updated. I bought two of these dual sink valves and both were easy to install which took less than 15 minutes. I installed the new valves the same way as the old ones, but you can change the settings if needed. My faucet was leaking at the base of the handle and now it won't drip. Success!
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