These John Guest flow bend clips are used to support 12mm semi-rigid tube when turning pipework through 90 degrees in hot and cold water systems in campervans, motorhomes, caravans, and boats.
The rigid plastic channels prevent the tube from kinking and collapsing and can be screwed to a suitable surface via two countersunk fixing holes.
Clip the tube into one end of the channel first, then carefully bend it round and clip it into the rest of the channel.