Vibrant Performance Aluminum Joiners are manufactured from 6063 Aluminum and require minimal surface preparation for tig welding. Vibrant Performance Aluminum Joiners are useful for creating affordable custom silicone coupling combinations and are commonly used for customer intercooler end tank fabrication or welding hose inlets/outlets to aluminum radiators. They are bead rolled and available in outlet diameters ranging from 1 in. to 4 in..