This is the SR-10 Dual Servo Reverser from Futaba. This is used to Y two servos, on one channel on your receiver. The Dual Servo Reverser will enable both servos to move as they should, by switching the movement of one of the servos. COMMENTS: A super accessory for dual elevator servos, dual flaps and twin- engine models- as well as in conjunction with Futaba's new GYA aircraft gyros. This will work on digital as well as analog servos.