I’m trying to replace my bathroom faucet (I turned off the water supply lines) and cannot get the base of the handles off.
Here are photos of the top and bottom:
Anything I should try?
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Channel locks or a slip lock wrench will work. Remove the metal piece on the threaded pipe first.
For the top, I agreee with @jstola but it looks kinda like someone may have filled the bell housing with caulk (the white goo out the top doesn't belog there). Once in a while, these housings have a small recessed hole with an allen nut inside; yours does not look like one of these, but if you see a small hole in it that looks useless, it probably is. Also, sometimes these fixtures are also threaded on (and I believe sometimes they are a reverse thread), yours could very well be one of these. If it is caulked inside, you might need to (sensibly) apply some heat to get it to break/melt free. Definitiely try the putty knife idea first, clean off all excess plumbers putty or caulk, and remove anything plastic. Dont cook the countertop.
Spray the rusted nut with WD40 or another type penetrating oil, helps a lot when fighting rust.