N-12® Dual Wall - HDPE Pipe

Corrugated, smooth interior, high-density polyethylene (HDPE) pipe

Introduced in 1987, dual wall N-12 pipe, with its smooth interior wall and corrugated exterior, offers exceptional hydraulics and strength. Built using application-specific high-density polyethylene, dual wall N-12 corrugated pipe also provides superior corrosion and abrasion resistance. This makes it an excellent alternative to reinforced concrete (RCP) and corrugated metal pipe (CMP).

N-12 pipe is available in soil tight (ST), water tight (WT) and plain end, all of which offer joint options of bell and spigot design, gasket, bell wrap or pressure-rated 10.8 psi coupler.


  • Smooth interior with a Manning's value of 0.012 resulting in increased flow capacity
  • Inert HDPE material is resistant to the effects of chemicals, abrasion, hot soils, and effluent
  • Lightweight product for best-installed cost and maximizing delivery and installation efficiencies
  • Structurally designed corrugated exterior to support typical construction and long term loading
  • Readily available in convenient locations to service local projects
  • Joint options to meet your application performance requirements, including up to water-tight joints meeting ASTM D3212
  • Available in ST, WT and Plain End
  • Joint options include bell and spigot design, gasket, bell wrap or pressure-rated 10.8 psi coupler


ADS' 0201LU 2 lb. tub and 0801LU 8 lb. tub lubricant products for gasketed pipe joints:

  • Soft, paste like compound
  • High performance pipe joint lubricant
  • NSF certified for potable water pipelines
  • Contains no petroleum-Will not swell gaskets
  • Stable from -10 to 120°F
  • Non-toxic
  • No objectionable odor
  • Will not support bacteria
  • Effect on gaskets-less than 1% weight gain and less than 1 duro hardness loss
  • Effectively lubricates pipe and pipe gaskets for safe and efficient assembly Ask your sales representative for more information on these and other ADS products.

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Product Information

ADS Dual Wall N-12 drainage pipe, available with multiple joining systems, provides corrugated-pipe strength and smooth interior wall hydraulics for increased flow capacity, in a lifetime package.

N-12 Dual Wall Specifications

Plain End Soil Tight (STIB) Water Tight (WTIB)
Diameters Available *4-60 inch (100-1500 mm) *4-60 inch (100-1500 mm) *4-60 inch (100-1500 mm)
Lengths Available 13, 20 feet (4, 6 m) 13, 20 feet (4, 6 m) 13, 20 feet (4, 6 m)
Joint Performance Soil Tight Soil Tight Water Tight (ASTM D3212)
Joining System External Coupler Integral Bell & Gasketed Spigot Water Tight Reinforced Integral Bell & Gasketed Spigot
Specifications AASHTO M252 (4-10 inch) (100-250 mm) AASHTO M252 (4-10 inch) (100-250 mm) AASHTO M252 (4-10 inch) (100-250 mm)
AASHTO M294 (12-60 inch) (300-1500 mm) AASHTO M294 (12-60 inch) (300-1500 mm) AASHTO M294 (12-60 inch) (300-1500 mm)
ASTM F2306 (12-60 inch) (300-1500 mm) ASTM F2306 (12-60 inch) (300-1500 mm) ASTM F2306 (12-60 inch) (300-1500 mm)
Design Service Life Minimum 100 Year Minimum 100 Year Minimum 100 Year

* 4" - 10" (100 - 254 mm) N-12 ST and WT available in limited areas.


Submittal Packages

Installation Guides


Details - Product

Connection_HDPE_and_HP_Storm_to_Manholes_and_Structures_A5.04_March_2016 Connection_HDPE_Bell_to_RCP_(Detail_605_02-16)-Model Connection_HDPE_CMP_(Detail_601) Connection_HDPE_CMP_wMarMac_(Detail_602) Connection_HDPE_RCP_(Tech_Note_603) Connection_HDPE_RCP_Bell_(Tech_Note_605) Connection_HDPE_RCP_w_MarMac_(tech_Note_604) Connection_HDPE_to_CMP_w_Geotextile_Wrap_(Detail_601_02-16)-Model Connection_HDPE_to_CMP_w_MarMac_(Detail_602_02-16)-Model Connection_HDPE_to_HDPE_(Detail_607_02-16)-Model Connection_HDPE_to_HDPE_w_MarMac_(Detail_608_02-16)-Model Connection_HDPE_to_Manholes_and_Structures_(Tech_Note_A5.04) Connection_HDPE_to_RCP_w_Geotextile_Wrap_(Detail_603_02-16)-Model Connection_HDPE_to_RCP_w_MarMac_(Detail_604_02-16)-Model Connection_HDPE_to_Structure_(Detail_201_01-17)-Model Connection_Integral_Bell_Transition_for_HDPE_Pipe_(Tech_Note_A5.10_01-10) Connection_Integral_Bell_Transition_for_HP_Pipe_(Tech_Note_A5.15_01-10) Connection_MH_Grouted_Waterstop_12in_to_60in_HDPE_(Detail_203_01-16)-Model Connection_Soil_Tight_MH_Nyloplast_Adapt_12in_to_24in_HDPE_(Detail_202A_01-16)-Model Connection_Water-Tight_MH_Boot_Adapter_12in_to_24in_HDPE_(Detail_204F_01-16)-Model Connection_Water-Tight_MH_Boot_Adapter_12in_to_60in_HDPE_(Detail_204B_01-16)-Model Connection_Water-Tight_MH_Gasket_and_Corr_Pipe_Adapter_Gasket_12_to_60_HDPE_(Detail_204E_02-16)-Model Connection_Water-Tight_MH_Mechanical_12in_to_36in_HDPE_(Detail_204D_02-16)-Model Connection_Water-Tight_MH_Precast_Compression_Gasket_12in_to_60in_HDPE_(Detail_204A_02-16)-Model Connection_Water-Tight_MH_Precast_Compression-Gasket_12in_to_24in_HDPE_(Detail_204C_02-16)-Model HDPE_Dual_Wall_Pipe_Perforation_Patterns_(Tech_Note_A1.01) N-12 Mitered Joint Pusher_(Detail_6086) Pipe_Flotation_(Tech_Note_5.05_03-16) Pipe_Joints_and_Gaskets_(Tech_Note_A1.05)

Inspect. & Maintenance. - Technical Literature

Structural Design - Technical Literature

Hydraulics - Technical Literature

Durability - Technical Literature


Case Studies/Approvals