MAINLINE™ Backwater Valve, 4 in Nominal, Hub, Full Port, ABS Body

The Full port BWV is designed to protect the entire home from hazardous sewage backflow. With a clear cover, you can be sure your backwater valve is operating properly. Designed to be installed as the last fitting on the outbound drain, this BWV can either be placed in a direct access location or recessed in-ground with the optional access box.