This is a large, soft, rubber tubing (hollow) that is easily configured to the space you have. It's able to bend at a sharp angle without kinking or folding.
I do not have Hex Fittings for this soft line.
This soft line equals the following equivalent 1:1 size at each scale.
1/16 scale = 3 3/4"
1/12 scale = 2 13/16"
1/8 scale = 1 7/8"
For 1/12 scale this can be used for roll bar padding.
For 1/8 scale, typical uses are radiator hoses and larger fuel lines.
This soft rubber line is easy to bend and shape to your installation.
Each package contains one coil of .234 x 12" rubber tubing