PVC DWV 1/4 Bend 90-Degree Schedule 40 Sanitary Elbow is used to turn the pipe 90 degrees. For sanitary drain, waste, and vent (DWV), sewer and storm drainage applications. They are used in gravity-fed waste elimination systems and are for Non-Pressure systems where temperatures will not exceed 140 degree F. PVC is lightweight and easy to install. They require no special tools for cutting, and can be installed with solvent cementing, threading, flanging, and roll-grooved joining.