PolyPipe, A polyethylene pipe, valve, and liner manufacturer McElroy Mfg. Fusion machines and equipment. The leader by design. Friatec The leading source for electrofusion fittings and processing equipment Central Plastics Molded HDPE fittings up to 24" in diameter Christy Concrete Reliable, cost effective utility box and vault solutions for the in ground construction of water systems and electrical utilities. Improved Piping Products Pipe Flanges and rings for HDPE and steel pipe grigory.com  articles on leak free systems using HDPE pipe American Water Works Association SPI Society of the Plastics Industry NRWA, the USA's Largest Utility Membership Organization  Water Online, the single internet website where you'll find all you need to know to keep up with the water and waste water industry. The Plastics Pipe Institute (PPI) is a division of The Society of the Plastics Industry, Inc. (SPI), the major trade association representing all segments of the plastics industry. The Water Environment Federation (WEF), An interactive electronic resource on water quality and environmental issues American Plastics Council ,known as the plastics resource, this web site contains extensive information on plastics and environment. Plastics News on the web WAIS ,The internet document source Carlon Tyco Telecommunication equipment PolySort, An internet marketing firm for plastics companies The Institute For A Sustainable Future - Envisioning, Design and Implementing Sustainablity