KB 20" Non-Pressure Manhole Covers

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Knappco's 20” KB Non-Pressure manhole with 10” fill opening for industrial, storage tanks & agriculture applications. Available Models:
  • KB1110 20" Non-Pressure Manhole Cover Carbon Steel, Hardware & Weld Ring w/Buna Gasket
  • KB3310 20" Non-Pressure Manhole Cover SS304, Hardware & Weld ring w/Buna Gasket