Grundowinch 3-, 5- and 10-ton hydrostatic constant-tension winches from TT Technologies are designed for the variable conditions in below-grade work, including pipe bursting, cable pulling, sliplining, pipe pulling and swage lining. Constant tension senses and automatically takes up any cable slack. All models feature protective cable storage and are available with air-cooled diesel or gasoline engine and adjustable boom system. 800/533-2078; www.tttechnologies.com.