Test tube stopper (4)
I believe the answer is:
bung
(Other definitions for bung that I've seen before include "could be a corker" , "Bribe - bottle stopper" , "Cask stopper" , "Bribe (slang)" , "Spigot or cork" .)
I believe the answer is:
bung
(Other definitions for bung that I've seen before include "could be a corker" , "Bribe - bottle stopper" , "Cask stopper" , "Bribe (slang)" , "Spigot or cork" .)