Manholes

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.