I've been working on this project for a while but I guess it hasn't made it to the forums yet. As you might have guessed, this is an artificial lung using the same pumping mechanism as my other save some people may have seen. I created every part from scratch and although it's still a bit buggy, I hope you'll enjoy it!

https://powdertoy.co.uk/Browse/View.html?ID=881539&PageNum=1