Elbow Fiberglass 45 Degree 3 1/2" to 4" Reducer | Centek 1200420 3 1/2" to 4" 45 Degree Fiberglass Reducer Elbow 3 1/2" to 4" 45 Degree Fiberglass Reducer Elbow | Centek 1200420 3.5 in. Inlet x 4 in. Outlet 45 Degree Reducer Elbow Fiberglass construction designed for marine exhaust applications 10.38 in. length