Industrial self-priming pumps designed for wastewater containing suspended particles. Made from cast iron, stainless steel, or duplex, with optional internal coatings of ceramic, polyethylene, or ETFE. Shaft sealed with a single mechanical seal in an oil bath to prevent wear and allow dry operation during priming, reducing the risk of overheating or seal damage. Semi-open impeller allows the passage of solids and fibers up to 3". Features external impeller adjustment to compensate for wear and restore performance. Front inspection cover facilitates maintenance and access to the equipment.