This Cummins remanufactured Celect fuel injector has a new nozzle, NOP spring, spring seat replacement and wiring harness. All O-rings have been replaced, and injector comes with a 90 day, no-hassle warranty, and has a 24 month or 125,000 miles on highway or 3,600 hours off highway warranty. There is an additional core charge of $175. You purchase your fuel injectors from us and pay the core charge up front. We allow you 30 days to send your core injectors back to us. MUST ADD ACE PRODUCT CODE # 9FI631764COR to the order.