Flexible T / Y, Landscaping Drain Pipe Adapter, 4 Inch, Black ADP53702 | eBay
4 inch wide Trench Drain Adapter for 2 inch Plastic Floor Drain Strainer (included) - Drain-Net Technologies
4" x 3" x 2" Corrugated Drain Tile Downspout Adapter at Menards®
Amazon.com : NDS 3P12 3-Inch by 4-Inch PVC Adaptor with Drain Waste Vent to Sewer and Drain Connection, White : Pipe Fittings : Tools & Home Improvement
FLEX-Drain 4 in. Copolymer Universal Drain Pipe Connector ADP53302 - The Home Depot
IBC Tote Tank Drain Adapter S60x6 Thread Cap Garden Hose Connector 1/2" 3/4" 1" - Walmart.com
Fernco DSC-534 4-Inch Drain Pipe and 5-Inch x 3-Inch Rectangular Downspout Connector - GreyDock.com