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

Plastic Processing Technologies, Inc.
Representing downstream extrusion machinery for PVC profiles and PE pipe. Includes a line of vacuum tanks, cutting equipment and materials handling for pipe and profiles.
http://www.pptinc.us

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/

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/

Air Logistics Corporation
Manufacturers of composite materials and frp materials. Specializes in corrosion protection, pipe wrap, and pipeline repair.
http://www.airlog.com/page3.html

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

Victaulic Mechanical Pipe Joining Systems
The mechanical pipe joining system including valves, couplings, and fittings for ductile iron, stainless and carbon steel, PVC, HDPE, copper and other materials.
http://www.victaulic.com

Rinker Materials Corp.
Rinker Group
http://www.rinkermaterials.com/

Liberty and Rocky Mountain Pipe
Liberty Pipe Companies supplies, designs, manufactures, fabricates, and installs equestrian, livestock and estate fencing and buildings. Performance Pipe Products, Fencing, Pipe, and Asset Recovery.
http://www.libertypipe.com/

Star Pipe Products
Star Pipe Products; a manufacture of ductile iron fittings, joint restraints, construction and municipal castings, AWWA grooved products, soil pipe and related products.
http://www.starpipeproducts.com