bathroomfaucetleaking
I have a leaky 2 handle bathroom faucet with the following cartridge below.
What brand is that cartridge/faucet (1st question), and is that so antiquated and old that I should replace the entire faucet (2nd question)? (It does not look like a design I've worked with previously.)
2nd question is more to, "oh no that's a terrible design and you shouldn't bother fixing that type of faucet," etc.. No need to effort replacing if this is not advisable.
The next step secret to getting more of this faucet apart are the two slots cut across the cupped part. See the arrows in the following picture.
It looks to me as that the cupped part is threaded down inside the larger diameter part that sticks up from the hole in the sink. There is probably a special tool used to engage these slots to thread the part out. It may be possible to lay a piece of metal bar stock across these slots as a tool. If you do that make sure that it has nice square corners.
grab the round base right below the handle that turns the water on and twist ccw to unscrew the faucet. this is a moen faucet. however, I have the same faucet in my bathroom. I called moen for parts and they said that most parts are not available since they discontinued production of this faucet. iF YOU ARE THE ORIGINAL OWNER of the faucet and can prove it they will send you a new faucet at no charge if the parts needed are not available.
Best Answer
Looks like a Price Pfister (or import copy thereof). Looks like a good quality faucet that is worth saving.
Note- you don't necessarily need to buy new "cartridges", these are totally rebuild-able unless physically damaged. The washers and o-rings should be readily available at a good hardware shop or plumbing shop (maybe not at big-box center). Waterproof grease and washers it will probably perform like new.
Look for Price Pfister widespread faucet parts. Bring the old because there are several configurations/types. If replacing stems/valves be aware that there are specific "left" and "right" because the levers move opposite of each other.