Its not exactly clear to me... are you talking about the hole the beer/wort flows through & into the tube when you press downt the racking cane portion?
Sorry its really blurry and reflective, try it out on a jug of water.. you'll find out real quick if its still working.
brewing English Bitter, Marika Saison, Oatmeal Stout
on deck Scottish 80/-
Bottled lost track....