B2 Fabrication 2.5" to 2" (63mm to 51mm) Silicone Reducer | Silicone Coupler 45 Degree Elbow- Black | Turbo- USA Ships from Detroit, Michigan, USA for prompt reliable shipping! Specifications- Inside diameter = 2.5" to 2" (63mm to 51mm): Coupler measures 10.75" (10 3/4")long 45 Degree Elbow Wall thickness = 5mm (4ply) polyester Versatile! Great for automotive and non automotive projects!