King Oil Tool products are sold, designed and manufactured in Enid, Oklahoma by GEFCO - the George E Failing Co. GEFCO has over 400,000 square feet of manufacturing and office space situated on 40 acres. Our facilities include a full functioning machine shop, weld shop, paint shop, and testing facilities.

History of King Oil Tools

Founded in 1937 by Walter E. King in Humble, Texas as a company providing service the geophysical industry, King Oil Tools has since grown to be the world's leading manufacturer of rotary drilling swivels.

Forty-four various sizes and models of swivels and tools are manufactured for use on reverse circulating, mineral exploration, core sampling, road boring, monitor, oil well, and well servicing rigs, and water well development. These tools are manufactured for both domestic and foreign markets.

The King Oil Tool product line and production capabilities were successfully moved from Humble, Texas to the company's new home in Enid, Oklahoma in 1999. The George E Failing Co. (GEFCO) is now responsible for the sales, engineering, design, and production of the King Oil Tool product line