Founded in 1969, APCOM is a manufacturer of parts for water heaters. Its Cookeville, Tenn., unit offers manufacturing products, such as spuds, flanges and main burners. It offers thermostats for different types, models, sizes and capacities of residential and commercial water heaters. It manufacturers water heater dip tubes in cross-linked polyethylene, polypropylene and polysulfone. Its product line includes standard items and custom products built according to original equipment manufacturer s specifications. Located in Franklin, Tenn., it provides a variety of support services to its customers, including product development and design, testing and production logistics. Its Web site provides detailed product information and photos, reference tools, file transfer and even links to a variety of other Web sites.