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The SIOUX 869-SF4 flapper and carrier is for use with 4" backwater valves in drainage systems. It reduces or prevents damage to dwellings from sewage backup. The flapper installs into the valve body via a removable carrier, which utilizes key-to-slot to ensure proper alignment.
The SIOUX 869-SF4 flapper and carrier is structurally rugged and molded from engineered resins to stand up to job site abuse. Valves can be adapted for standard, shallow-D, or deep-bury installation.
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