They are nessesary parts to connect two metallic tubes and esspecialy we need themn for Turbo applications, where the pressure is extremely high comparing with normaly aspirated cars.
Silicone Couplers, adapters. These fiber reinforced multi-layer silicone couplers are of the highest quality. We have put these to the test on cars that run in excess of 40PSI at the track. Don't settle for cheap imitations.