Someone used duct tape which is wrong, it should have been foil tape instead.
For the rest it may be best to use mastic.
http://rcdmastics.com/
It also looks like someone tryed to do a DIY job on there it connects to the trunk line.
For the rest it may be best to use mastic.
http://rcdmastics.com/
It also looks like someone tryed to do a DIY job on there it connects to the trunk line.