Permalok® Corporation is the leading manufacturer of the proprietary interlocking pipe joining system that removes the need for welding to join steel pipe. Ranging in sizes from 8-inch to 156-inch OD Permalok®, with over 25 years of experience, Permalok® has provided in excess of 4,000,000 linear feet of pipe in a variety of applications becoming the preferred weld-less steel casing pipe in the trenchless construction industry.