RectorSeal 4 in. PVC Clean Check Extended Backwater Valve

Check extendable backwater valves prevent sewage backup into a residence or building as a result of a plugged sewer system, excess volume in the system or groundwater flooding. It prevents sewage backup into plumbed structures as a result of a plugged sewer system, excess volume in the system or groundwater flooding. They are designed to be installed easily outside a home, business or other structure, without using a costly manhole, and are readily accessible for maintenance or cleaning.|No manhole required|Installs discretely outside - up to 12 ft. below ground level|Above ground outdoor maintenance accessibility eliminates hidden access indoor applications, and the sewer odor and mess of indoor maintenance|Meets IPC, UPC/IAPMO, ICC, IRC, CSA plumbing codes