Releases waste to outside of buildings in the event of sewer line blockage, preventing costly damage due to sewage backflow or overflow. Applicable in residential, commercial, or industrial settings- any structure connected to sewer lines or septic tanks Patent #4,475,571. Meets ASTM specifications. Automatic unlock and re-lock. Vandal- resistant. Safe in yard or high traffic areas. Solvent welds over 4″. Schedule 40 DWV pipe. Removable lid provides full access to cleanout. May be used to replace existing exterior cleanouts. Easily adaptable to new or existing sewer lines. Water and waste swirl in bowl until blockage is cleared
