Hi all. I have an Eheim Pro II 2026 that I got used. There is a little site glass type thing that lets you see how much water pressure is going through the unit. There is supposed to be a little ball or something that goes up or down on the site? Anyway I was cleaning out the whole unit and took the red cylinder and spring out to clean in therwe site housing and I think I might have lost the little ball (if there even was one). The pic below shows what parts I have. Do I still need a little ball or something? Seems when I put the spring back in, there is not prsssure on the spring, as if some part is missing? Thanks for any suggestions you might have.
Gregg
Gregg