Lippert 045-136046 Polarity Reversing Solenoid by Trombetta - Bronze. Brand new never installed. This solenoid is generally found in motorhome applications and primarily used in Lippert leveling and slide-out hydraulic power units. Trombetta 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. Brand new ,never installed .