WACKER NEUSON PST2-400 2 In. Elect These high performance single-phase submersible pumps. Silicon carbide-faced double mechanical seals run in an isolated oil-filled cavity. Lightweight, compact design with heavy-duty strain relief power cord. PST models feature shaft-mounted agitators which suspend solids when pumping sand and debris. Built-in thermal protection prevents motor damage due to impeller blockage, reducing service repairs