This filter fits the following generators: MicroLite - KY 50 Hz - Spec Letter A; MicroLite - KY 50 Hz - Spec Letter B-H; MicroLite - KY 60 Hz - Spec Letter A; MicroLite - KY 60 Hz - Spec Letter B-H; MicroQuiet - KY 50 Hz - Spec Letter J-K; MicroQuiet - KY 60 Hz - Spec Letter J-K.