LASCO 25-6830 Drain Pipe 90 Degree Elbow Flexible Rubber Connector with Clamps, 1 1/2" x 1 1/2" - Amazon.com
ProPlumber Rubber Coupling in the Water Pump Accessories department at Lowes.com
1/2 to 3/8 Reducer Faucet Adapter - Compression Brass Pipe Fitting, 3/8 Male to 1/2 Male Supply Line Adapter for RV Kitchen Plumbing, Water Hose Pipe Connector with Rubber Washer, (2 Pack) - Walmart.com