United Pacific 90652 LED Flasher 2 Terminal LED Signal Flasher Switch With Polarity Reversing Adapter - 12V Use on vehicles with LED front turn signals, side markers and tail lights. Replaces the original 552 or 536 under dash flasher, plug & play. Includes 2 terminal flasher switch and polarity reversing adapter. Polarity reversing adapter solves reversed issues on some applications.