costs 1euro from any pert store,
the aquarium air stone valve only lets liquid one way so you can leave your nipple open and pump away, tube is cheap too if you dont already have one petshop got em,
I used an old resivor as a old fluid chamber , just put a breather hole in it.
but you can use anything as a run off bag.:bag:
Just in case the idea is useful to anyone:thumbsup2:
I used this to change the fluid without any bother,
If you worried about any air I heard that cable ting your levers will leave any air bubbles rise to your res, dunno about that? hopfully there will be none.
:thumbsup2: