ECO-FLO, 1 HP, 230-Volt control box is designed for us with 4 in. submersible well pumps fitted with 3-wire submersiblemotors of the same HP and voltage. 3-wire motors have 3 service wires plus 1- ground wire. It includes easy to read wiring diagrams. Supplied in rugged NEMA 3R enclosure. Has numerous electrical knock outs for easy installation. Can replace other manufacturer's control boxes for 1 HP 4 in. submersible motors. Has heavy-duty terminals for wire as large as #4AWG. Capacitor start and induction run for efficiency and starting ability