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.
1/25 scale  =  4"  .
1/16 scale = 2 1/2" Excellent size for Roll Bar Padding due to the thin wall - slice it down the middle with an x-acto knife and put it over your chassis tubing
1/12 scale = 1 7/8"
1/8 scale  =  1 1/4"

For 1/12 and 1/8 scales, 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 .157 x 1' rubber tubing