What does “flexible filler” refer to in Standard Detail W6 (Air Valve Assembly)?

The “flexible filler” in Detail W6 refers to a material used to seal the air valve access riser while allowing for pipe movement. Refer to:

  • MMCD Section 33 11 01 – Waterworks
  • MMCD Section 33 44 01 – Manholes and Catchbasins
    Common standards include ASTM C923 or ASTM C990.

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