Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:6203448.

I've written up some details on the build here

In playing around with peristaltic pump designs quite a bit lately, I was curious how well the same basic idea would work as a valve...not too bad, in my opinion :)

Currently used as a manually controlled valve. It can have three lines closed at a time, but could be configured for up to four lines if you are ok with one of the lines being normally open.