Precast concrete manholes are essential components of underground infrastructure, providing durable, accessible entry points for sewer, drainage, and utility systems. At Precon, we manufacture manhole components in strict accordance with ASTM C478 standards, ensuring consistent performance, structural integrity, and compatibility across installations.

Each section—including base, riser, conical top, grade ring, and flat slab—is engineered with precise reinforcement, watertight joints, and HS-20 traffic-rated capacity where required. Our manholes are built for longevity, ease of maintenance, and rapid installation, offering dependable performance for municipalities, engineers, and contractors across California.

Manholes
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48” x 24” Manhole Without Steps

  • Model Number: MH4824NS
  • Steps: Without Steps
  • Inner Diameter: 48"
  • Ring & Cover: 24"
Documents

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48” x 24” Manhole With Steps

  • Model Number: MH4824ST
  • Steps: With Steps
  • Inner Diameter: 48"
  • Ring & Cover: 24"
Documents

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48″ x 30” Manhole Without Steps

  • Model Number: MH4830NS
  • Steps: Without Steps
  • Inner Diameter: 48"
  • Ring & Cover: 30"
Documents

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48″ x 30” Manhole With Steps

  • Model Number: MH4830ST
  • Steps: With Steps
  • Inner Diameter: 48"
  • Ring & Cover: 30"
Documents

Please contact us for product information.

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48″ Manhole LA City Drywell

  • Model Number: MH48DWLA
  • Inner Diameter: 48"
  • Options: LA City Draywell
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48″ Manhole LA City Type 1 Lining Armorlok

  • Model Number: MH48ALLA
  • Inner Diameter: 48"
  • Options: LA City Type 1 Lining
    Armorlok
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48″ Manhole Base

  • Model Number: MHB48
  • Inner Diameter: 48"
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48″ Manhole Base Anti Float

  • Model Number: MHB48AF
  • Inner Diameter: 48"
  • Options: Anti-float
Documents

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