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Concrete (8) Plastic (9)

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	American Water Works Association (AWWA) - http://www.awwa.org National organization for clean water and water distribution systems. Develops standards for water pipes and hosts a supplier directory of pipe manufacturers for all materials.
	DIPRA - Ductile Iron Pipe Research Association - http://www.dipra.org/ Manufacturers association supported by the Ductile Iron pressure pipe manufacturers in North America.

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