This is a soft clear tubing that is easily configured to the space you have. It's able to bend at a fairly sharp angle without collapsing.  

For fittings, see Hex Fittings or Size I Ferrules sized at .080 for this clear line.

This soft line equals the following equivalent 1:1 size at each scale.
1/25 scale = 3/4"
1/16 scale = 1/2"
1/12 scale = 3/8"
1/8 scale  =  1/4"

Each package contains one coil of .080" x 12" clear tubing.