The Cummins 140-3280 Onan Air Filter is designed with a special foam pre-cleaner for use specifically in Cummins Onan RV Generators. Please refer to your Operator's Manual for specific maintenance intervals. Fits Onan Generator Models KYD 50 HZ (Spec A-B), KYD 60 Hz (Spec A-B), KY 50 Hz (Spec B-H), KY 60 Hz (Spec B-H), KY 50 Hz (Spec J-N, P), KY 60 Hz (Spec J-N, P). KY 50 Hz (Spec B-H), KY 60 Hz (Spec B-H), KY 50 Hz (Spec J-N, P), KY 60 Hz (Spec J-N, P) | Camping World Cummins 140-3280 Onan Air Cleaner Element