The Air Conditioner has quite a bit of hoses in the tunnel area that have a potential to cause chafing against the rudder cables. SFSA provided some vinyl tubing. It was just a little short for both sides. I got some extra but it wasn't pre-split. I made a Tube Splitter out of a 2x4 and a razor blade. I cut an angle off the 2x4, drilled a 1/2 inch hole and then split the 2x4 in half. I inserted a razor blade and clamped it together. Passing the tubing through the hole splits the tubing lengthwise and makes nice anti-chafe protection in the tunnel.