the rubber line is pressed in like an arrow, not glued. yes if that seal is broken the entire intake manifold needs to be replaced, we tried like hell to get peirburg to sell us a new hose when we disassembled a slk55 manifold as we wanted to coat the bottom section as well but they would not. yes if there is a little bit of good rubber left there, cut and extend the vacuum line with a double male vacuum adaptor. that regulates the flappers inside the intake manifold switching from short to long runners.