Replacement screw terminal block connector for Digitrax DCC command station systems and boosters (DB150, DB200+, DCS100, DCS200, Zephyr / Zephyr Xtra / DCS50 / DCS51, Super Chief, Super Empire Builder, etc - should fit any that have the 7 pin connector. Same as Digitrax part #'s BLKBOOSTPLU and BOOSTERTERMPLUG. Feel free to email if you have any questions.