Thompson Pump’s 3STC is a three-inch, self-priming centrifugal sewage trash pump, which features heavy-duty cast iron construction, a ductile iron impeller, quick start-up self-priming and automatic re-priming, and a dry running mechanical seal. Designed for portable pumping, as well as permanent installation, the pump is a good fit for any application with liquids having a high concentration of solids in suspension including sewer bypasses, lift stations, and treatment plants.