We ship all of our genuine John Deere parts, including this John Deere O-Ring U12331, five days per week. We ship primarily via UPS, USPS, FedEx and truck freight. Once your order leaves our warehouse, you will receive a tracking number via email. Most orders ship within 1-3 business days. If you have placed an order on the weekend, during a holiday or after 4pm EST during the week, we will begin processing your order during our next business day.