The following list prepared by the Plastics Pipe Institute  (http://plasticpipe.org/) lists their members who are involved with HDPE Piping Systems, with links to each company website.

HDPE Piping Systems

A H McElroy Sales & Service
Advanced Drainage Systems
American Maplan Corp.
BASF CORP
Blue Diamond Industries
Centennial Plastics, Inc.
Charter Plastics, Inc.
Chevron Phillips Chemical Company LP
Dow Chemical
Dura-Line Corporation
Endot Industries Inc
Fast Fusion, LLC
Flint Global Poly
Flying W Plastics
Formosa Plastics Corp., USA
Georg Fischer Central Plastics LLC
Golan Plastic Products LTD
Hancor, Inc.
Harco Fittings
HD Supply Waterworks
High Country Fusion Company, Inc.
Hosokawa Polymer Systems
Improved Piping Products
Independent Pipe Products, Inc.
Industrial Pipe Fittings
Ineos
Ingenia Polymers Group
IPEX USA LLC
IPEX MANAGEMENT
ISCO Industries, LLC
JM Eagle
Kerotest Manufacturing Corp.
Krauss Maffei
KWH Pipe
LyondellBasell
McElroy Manufacturing, Inc.
Milacron LLC
Milford Pipe & Supply
Nova Chemicals
NUPI Americas
Performance Pipe
Pipeline Plastics, LLC
PolyOne Corp
PolyPipe by Dura-Line
Ritmo America, LLC.
Sabic
Sandale Utility Products Inc.
Spartech Color & Specialty Compounds
Superlon
Teel Plastics
Thornton and Company, Inc.
TOTAL PETROCHEMICALS USA, Inc.
United Poly Systems, LLC
Wegner Welding LLC
Widos Welding, LLC
WL Plastics CORP
Wolseley