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Original Mechanical Diesel Engine Piston Ring 4955366 3970518 3976339 4932801 for 4b3.9 6A3.4 6b5.9 B7 Cm2350 Cummins. Genuine Original Quality: 100% genuine original piston rings for Cummins engines. Wide Compatibility: Compatible with 4b3.9, 6A3.4, 6b5.9, B7, and Cm2350 models. Low MOQ Support: Minimum order quantity starts from just 1 piece. Fast Delivery: Lead time is typically 3-5 days based on inventory. Multiple Certifications: Certified with CCC, ISO9001, CE, RoHS, and TS16949. Custom Packaging: Supports original, neutral, or customized packaging. Flexible Payment: Accepts 100% T/T payment before shipment. Official After-Sales: Enjoy official Cummins China after-sales service.