Amazing product. Only problem was that we found the instructions in the last box we opened by which time we had already put it together
I use the tunnel system to connect a two story hutch to a run. I get so many compliments on this setup. Bunnies need space and any outside hutch is always to small. So now my bunnies can get exercise in the run or privacy in the hutch. They run back and forth in the tube. The bunnies even hang out in the tube. It is funny to watch one bunny hop over the other bunny who is already hanging out in the tube. I like how the tube has air vents, it would get too hot without them. Also the vents prevent water from collecting in the tube. The way the tube attaches to the doors is quite good. I have had system for a month, I hope it is durable and lasts a long time. The only negative is that it came shipped without one of the packages of screws. I called and they were nice and mailed me the screw kit I was missing. As a side note the instructions for kit tell you to cut a square hole in wood hutch for attaching door kit. It works but I cut a circle. Having the round tube going to a round hole prevents the bunnies from chewing on the wood that surrounds the door entrance.