Manholes

Choosing the Right Manhole Cover

The cover and frame you need depends on three things: what’s going over it (foot traffic, vehicles, heavy equipment), what environment it’s in (roadway, coastal, chemical facility), and what access dimensions the opening requires.

Material

Cast iron — The industry standard for load-bearing applications. Handles vehicle traffic, resists settling, and lasts decades. Choose cast iron for roadway installations, parking areas, and any location with vehicle exposure.

Composite — UV-stable, corrosion-resistant, and significantly lighter than cast iron. The right choice for coastal environments, chemical facilities, and sites where corrosion would destroy a metal cover over time. Won’t rust, won’t degrade in sunlight.

Steel skirt — Heavy-gauge steel frame for maximum structural rigidity. Used where the frame needs to anchor into concrete or asphalt under traffic loads.

Configuration

• Lay-in lid — Drops into the frame flush. Easy to remove for access, standard for most installations.
• Bolt-down lid — Secured with bolts for tamper resistance. Required for secured facilities and high-traffic locations.
• Cam-lock — Quarter-turn locking mechanism on composite covers. Faster than bolts, more secure than lay-in.

Common Sizing

Round covers from 6” to 44” diameter. Square covers from 18” to 36”. Frame depths from 5” to 24”. If you’re replacing an existing cover, measure the opening diameter and frame depth before ordering. Not sure? Call us at (866) 514-3684 — we help contractors and engineers spec covers every day.

Related Categories

• Cast Iron Covers & Frames
• Composite Covers & Frames
• Steel Manhole Covers
• Manhole Hooks & Lifting Tools
• Manhole Accessories