Valley Roller, 101 Sentry Dr, Mansfield, TX 76063, US

For more than 80 years, Double E has been serving the oil and gas industry with the standard as well as custom-engineered and manufactured oil-well tools, pollution control equipment and molded rubber parts. The company offers a variety of products, including production tools, such as blowout preventers, stuffing boxes, flapper valves, leak sensors and leak catchers, polished rod lubricators, rod guides, integrated wellheads and slim hole/dual completion stacks; completion equipment, including standard, gas line and concentric packers; and well-servicing tools, such as well-servicing blowout preventers, standard hydraulic oil savers, cap king for capillary tubing, suck rod strippers, oil saver rubbers, packing, flagging materials and pump and hose conditioners. Double E is headquartered in Dallas, with other office locations in Texas, Missouri, West Virginia, New Mexico, Illinois, Wyoming, North Dakota, California, Louisiana, and Kansas.