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Culvert end section made from corrugated metal pipe.

CMP End Sections by Contech

Contech End Sections provide a practical, economical and hydraulically superior method of finishing a variety of culvert materials. The lightweight, flexible metal construction of Contech End Sections creates an attractive, durable and erosion-preventing treatment for all sizes of culvert inlets and outlets.

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CMP End Sections

Economical and hydraulically superior end treatment for culverts

Contech End Sections provide a practical, economical and hydraulically superior method of finishing a variety of culvert materials. The lightweight, flexible metal construction of Contech End Sections creates an attractive, durable and erosion-preventing treatment for all sizes of culvert inlets and outlets. They can be used with corrugated metal pipe with either annular or helical corrugations, and both reinforced concrete and plastic pipes. End Sections can be salvaged when lengthening or relocating the culvert.

Why End Sections Matter

Unprotected pipe terminations erode embankments, destabilize roadway shoulders, and create safety hazards. A properly specified end section extends overall pipe service life, reduces maintenance costs, and satisfies DOT and municipal drainage requirements — all at a fraction of the cost of remediation.  Most common cause of culvert failure is improper end treatment.  

Protecting pipe inlets has been a critical design consideration since the very first installation. Our end sections deliver a time-tested solution across the full range of round and arched corrugated pipe – with unmatched material availability and lead times that keep projects on schedule.

A dirt trail curves through grassy terrain with scattered rocks, pine trees, and metal culverts under a blue sky.

CMP End Sections

Protecting pipe inlets has been a critical design consideration since the very first installation. Our end sections deliver a time-tested solution across the full range of round and arched corrugated pipe – with unmatched material availability and lead times that keep projects on schedule.

✓ GOOD ★ BEST

Galvanized
Proven protection. Reliable performance. Project-ready inventory.

Aluminized Type II (ALT2) Steel
Enhanced longevity where galvanization isn’t enough.
  1. Compatible with standard corrugated metal pipe (CMP)
  2. Cost-effective baseline for moderate service environments
  3. Widely accepted by state DOTs and county specifications
  1. Aluminized Type II for superior performance
  2. Outperforms galvanized in mildly aggressive environments
  3. 6” - 96” diameter
  4. Ideal for storm drainage
  5. Extended service life reduces lifecycle replacement costs

CMP End Section Properties

  GALVANIZED ALT2
Diameters: 6" to 96" 12" - 42"
Specification: ASTM A929 / M218 ASTM A929 Type II
End Types Projecting · Mitered · Safety – 4:1, 6:1 & 10:1 slope Projecting · Mitered · Safety
Twin metal drainage pipes surrounded by rocks and plants, set in a rural landscape under a clear sky.
Three large black drainage pipes embedded in rocky ground at a construction or excavation site.
A large metal drainage pipe surrounded by rocks is embedded in a grassy embankment under a clear sky.

End Section SP

The Transition Challenge, Solved. 

Contractors face the challenge of terminating plastic pipe with a durable, hydraulically efficient end section. End Section SP (steel-to-plastic) – featuring a protruding HDPE pipe stub secured by a positively retained rod-and-lug assembly – eliminates joint separation, infiltration, and embankment migration at the critical inlet/outlet interface.

Bridging the gap between metal and plastic pipe systems. Our HDPE connection end sections provide a watertight transition between corrugated metal end sections and HDPE pipe, eliminating the need for costly custom fabrication or field-improvised adapters in HDPE pipe applications.

✓ GOOD ★ BEST

Standard End Section SP
The right connection, engineered from the factory.

End Section SP Rod & Lug Retained System
Positive retention means zero migration — guaranteed.
  1. Galvanized metal end section with rod and lug
  2. Available in 6”–60″
  3. Replaces ad hoc field fabrication with a tested solution
  4. Eliminates misalignment risk at pipe -to-end wall junction
  1. Mechanical lock prevents stub pull-out under hydrostatic load
  2. Diameter range 6″–60″
  3. Critical for high-velocity and steep grade installations
  4. Inspection-friendly: retention hardware is field-verifiable
  5. Engineered for positive retention

End Section SP Properties

FEATURE DETAIL

Available Diameters:

12" - 60"

Retention Method:

Rod & Lug (galvanized steel)

Coating Option:

Galvanized

Stub Material:

HDPE (dual wall corrugated)

Seal Option

Elastomeric gasket (best tier)
Application: HDPE Corrugated Pipe Systems
A metal HVAC duct transition fitting with a round opening and flared rectangular base on a concrete floor.
A large metal funnel with a black corrugated pipe attached, lying on a workshop floor near shelves and tools.
A large, angular metal duct piece with a circular opening sits on a workshop floor.

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