What is this?
#2
Looks like the tube that activates the doors on the heating system. Easy fix cut both ends of the break with a razor blade or sharp knife. you can then use a pc of vacume line to join the 2 pc back togeather. or you can use a pc of shrink tube but you sorta need 4 hands to do that someone to hold things tight togeater while the other person shrinks the tube. those are a comon break as they get pretty brittle over time...