S4SHR and S4SHR-LP 4-inch hydraulic submersible shredder pumps from Hydra-Tech Pumps rip and shear solids with a 360-degree shredding action. The carbide-tipped impeller and hardened macerator suction plate work together to produce a violent shredding action that keeps the discharge open. The S4SHR is suited for municipal, industrial, agricultural and institutional applications. The S4SHR-LP is narrower at 21.5 inches, allowing it to fit through most manholes. A guide rail assembly is available for stationary applications. 570/645-3779; www.hydra-tech.com.