6061 Transition Reducer 3.5" to 4" .080 aluminum tig weld turbo fabrication $35.95 Brand SDL Manufacturer Part Number T354 Surface Finish Polished Country/Region of Manufacture United States Performance Part Yes condition New 3.5 inch to 4 inch transition. Dimensions are OD. Transition has a polished finish. Made of .080 6061 aluminum. Made in York, PA. Any questions please ask. Free S/H.