LTWFITTING 90 Degree Elbow Stainless Steel 316 Barb Fitting 1/4-Inch ID Hose x 1/8-Inch Male NPT Air Gas (Pack of 5): Amazon.com: Industrial & Scientific
4 Inch Stainless Steel 304 High Quality 90 Degree Bend Elbow Exhaust Pip Fitting - Walmart.com
Amazon.com: 4" Stainless 90° Mandrel Bend Elbow - 14GA /.078" Wall - 2" Leg - SS304 Stainless Steel Elbow Exhaust Piping for Car Exhaust Pipe Modified, Stair Handrail, etc - ATOTL : Automotive
4 Inch ID-OD X 10 Inch OAL 90 Degree Aluminized Steel Elbow - 4 State Trucks