You’ll need a tool to get the old one out. There are probably over 100 available starting with the one on top which is also a cap for the valve stem on you car. Yours is sitting pretty high so you might be able to remove it with a small pair of needle nose but you want to be careful not to do any damage to the threads.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
