3-inch to 2.75-inch Rubber Reducing Insert: Sy-Klone International
Drain Coupling, 3 to 2 In. Straight Adaptor, PVC Rubber
3" x 2" DWV PVC Reducer Fitting P102-338
Black Silicone Hose Coupler, 3 1/4 inch ID, 4 inch Length - Pegasus Auto Racing Supplies
Reducing Insert 3" OD to 2.75" ID: Intake Hoses
Charlotte Pipe 2-in x 3-in PVC DWV Adapter Coupling in the PVC DWV Pipe & Fittings department at Lowes.com
3" x 2-1/2" Flexible PVC Coupling DS56-3215 - Buy Online
2" to 3" Inch Reducer Silicone Hose
HPS 2 3/8 to 3inch (60mm to 76mm) 4-ply Reinforced 45 Degree Elbow Reducer Coupler Silicone Hose Blue | HTSER45-238-300-BLUE
Black Silicone Hose, 3 1/2 x 3 1/4 inch ID Straight Reducer - Pegasus Auto Racing Supplies
Fernco 1056-32 Reducing 3-in. x 2-in. Flexible PVC Pipe Coupling for Cast Iron and Plastic Plumbing Connections in Black - Hydraulic Couplings - Amazon.com