This is a prototype of a pneumatic chicken coop door I put together in my garage. I figured it would be wise to perfect this contraption before I installed it to the coop. Plus! With this past winter being as brutal as it was it was alot warmer in there. I actually have this on the coop fully functioning and as proud as can be (being I am new with pneumatics). I had most parts laying around my garage so I figured why not make a automatic coop door. Now I'm just waiting on a thank you from the chickens!