Rinker Materials Corporation.
Rinker Group
http://www.rinkermaterials.com/ProdsServices/ConcretePipe/default.shtml

Perma-Pipe, Inc.
Manufactures pre-insulated pipe and double containment pipe for the oil and gas industry. Also offer leak detection and location, heat traced cathodic protection systems and pipe inspection services.
http://www.permapipe.com/

Clow Water Systems Pipe and Fittings
Clow Water Systems Company has been one of the United States premiere manufacturers of iron pipe and fittings in the waterworks industry.
http://www.clowwatersystems.com

Walz
WALZ - one of the worlds top producers of highly sophisticated photosynthesis measuring systems. The current product line ranges from the well known PAM Chlorophyll Fluorometers to measuring systems of plant gas exchange for physiological and ecophysiological research
http://www.walz.com/

TT Asia Pacific Pty Ltd.
TRACTO-TECHNIK is a modern and innovative family-owned company for special machines with its headquarters in Lennestadt, Germany. TT is a specialist for underground installation and pipe bending technologies and experiences an upward trend in trade d.
http://www.tt-asiapacific.com/

Nowak Pipe Reaming, Inc.
InneReam Trenchless Pipe Replacement - utilizing a directional drill, specialized tooling and techniques to grind and remove the existing pipe as the replacement is pulled into place.
http://www.pipereaming.com/

Accu-pipe Ramming Systems, Inc.
Located in Edmonton, Alberta and Regina, Saskatchewan. Specializes in trenchless technologies such as directional earth boring, pipe ramming, pipe bursting, and soil remediation.
http://www.accupipe.com/

Raytech Measuring Systems
Raytech Measuring Systems builds and sells precision measuring equipment for industrial manufacturers.
http://www.raytech-measuring.com

No-Dig-Pipe, Microtunneling Clay Pipe
No-Dig, A Division of MCP Industries Inc is the manufacturer of the first rigid bodied, clay pipe for use in microtunneling, sliplining, pipe bursting and in casings in the United States. Our first installation was in Houston Texas in April 1992. Since that time, over 70,000 linear feet of NO-DIG pipe have been installed.
http://www.no-dig-pipe.com/

Advanced Drainage Systems [ADS]
ADS Advanced Drainage Systems is the world's largest manufacturer of polyethylene corrugated HDPE pipe products.
http://www.ads-pipe.com/