JockoT, I was thinking that something like this would reduce any issue with flow
https://encrypted-tbn0.gstatic.com/i...94iF6WvEFTlid1
https://encrypted-tbn0.gstatic.com/i...Thvw5q9EEXrrzd
While this would be used on the outside of the pipe on top of the peltiers to transfer the heat to the cold side of the system
https://encrypted-tbn0.gstatic.com/i...-mDDqw-7oOAl0k
Obviously with another pipe around it to keep the system closed!!