3680883 valve collet, interchangeable with 3679978, sold in pack of 48 for Cummins ISX, QSX, X15 engines. Produced from high-quality spring steel, it owns strong clamping force and excellent anti-fatigue ability. It firmly fixes valve spring retainer to guarantee stable valve operation. Standard size matches original components for easy assembly. Cost-effective bulk packaging is ideal for repair shops and fleets with large-scale engine maintenance demands.