Ed is right. Its called the plunger though
Change it, you're good to go. Make sure you grease the plunger when you put it back in though, to save the orings from those dreaded threads.
"Originally posted by paintmusician
: Wow, you look like an extremly rich druglord, in other words, a ****ing savage"
"Originally posted by dholmblad
: fatty, I want to be you when I grow up. I could see you hunting with your bare hands."