stopcocks
n. 管閂( stopcock的名詞複數 ); 活塞; 活栓; 旋塞閥
A stopcock is a tap on a pipe, which you turn in order to allow something to pass through the pipe or to stop it from passing through.
Plug stopcocks with sterile plugs.
在三通開關上塞上無菌塞子.