Charlotte Pipe 1/2-in x 10-Ft Schedule 40 PVC Pipe in the PVC Pipe & Fittings department at Lowes.com
Camco RV Easy Slip Elbow and 4-1 Adapter | Features a Larger Inside Diameter for Faster Dumping and Adapter Fits 3-Inch Slip or 3-Inch,3.5-Inch and 4- Inch Threaded Pipe (39144) - Walmart.com
PVC Conduit, 3-1/2 Inch Diameter, Schedule 40, 10 Feet | Crescent Electric Supply Company
PVC Foundation Sleeve 3" - 3 1/2" - 24" Long
Charlotte Pipe 3-in dia PVC Female Adapter Fitting in the PVC DWV Pipe & Fittings department at Lowes.com