US Saws air-powered "Belly Saw" cuts the underside of pipes from 6-inches to 18-inches in diameter with minimal excavation required. Using its' two handles, you cut the pipe from the bottom up; when used with the optional roller strap, the saw rotates around the pipe. The Belly Saw has 4 spring-loaded wheels designed to help the operator cut square and straight. With air as its' power source, it also has the advantages of being lightweight, fume free for safe use in confined spaces and an exhaust snorkel for under water use.