The S4THL 4-inch hydraulic-drive vortex-impeller trash pump from Hydra-Tech Pumps offers 3-inch solids handling and head capabilities up to 210 feet. It can be bolted directly into a pipeline or fitted with a suction hose for underwater dredging. Combined with HT50 to HT75 power units, it is capable of flows up to 1,000 gpm. This safe and variable-speed hydraulic-drive submersible pump can be used where electric power is hazardous or impractical. 570/645-3779; www.hydra-tech.com