The Vacmasters System 4000 air excavator has the brute force to dig deep down with air, exposing utilities in even the hardest soils without harming them. It allows technicians to dig faster and safer in soil that is hard, wet, sunbaked or compact, including ground frost. This unit provides operators with seven to eight minutes average potholing time and efficiency in backfilling with no mud hauling or disposal costs. It offers remote operation, a low-maintenance design, hydraulic-powered dumping, a supervisory control panel, self-purging filtration system and a fast-acting interceptor canister. 800/466-7825; www.vacmasters.com.