AKA constant tension.
These are the only kind to use as they expand and
contract as the pipe expands and contracts with
temperature changes. They are also lined with SS
so they don't damage expensive silicone rubber hose.

http://www.breezeclamps.com/products.htm

These are widely sold in truck stops in the US.

Apparently McMaster does not carry them.

breeze@breezeclamps.com

http://tinyurl.com/46ao4ae
amazon
http://tinyurl.com/4936864

Paul Lamar