You should be able to replace the valve core on any Schrader valve. You just need a valve core tool and the new valve core.

Valve cores on some presta valves can also be replaced, but this is becoming less common.

Do a Google search for "schrader valve core" and "valve core removal tool" to see what you're looking for. A plastic valve core removal tool comes with Slime tire sealant. (Not that I'm recommending Slime. )