B2 Fabrication 4.5" Aluminum Pipe Joiner | Silicone Hose Adapter | 4 1/2" Aluminum Coupler- Turbo Manufactured and ships from Michigan, USA for quality craftsmanship as well as prompt reliable shipping! Made from 6061 Aluminum Specifications- out side diameter = 4.5" ; Joiner measures 3" long Bead rolled edges ensures that the hose stays place- even under pressure! Versatile! Great for automotive and non automotive projects!