Aftermarket DPF for Caterpillar No Core Charge - New Unit - Free Shipping Part Number: 20R-8033 Warranty options: 1-year warranty Not sure about something? Contact us, we're happy to help. DPF Canada offers new units, no core charges, and no core returns are required. Choose your warranty if multiple options are available. DPF Canada provides free shipping for 20R-8033.