The Polarity Reversing Solenoid is primarily used on hydraulic leveling and slide-out units. Reversing Polarity DC Contactors provide a cost-effective and simple solution for reversing polarity of permanent magnet DC motors. Integrating two DC Contactors into a single housing unit, Trombetta has eliminated many costly materials and streamlined final product assembly and wire connection. Solenoid is primarily used on Hydraulic Levelers and Slide-Outs. Comes in silver. Cost-effective and simple solution for reversing polarity of permanent magnet DC motors. No assembly required.