Features: 1.Application: The cable is used to connect to all 9 pin diagnostic connectors in cab and connect to all 6 pin diagnostic connectors in cab. 2.Reference OE Number: The part numbers for reference are 121891, 121721, please confirm whether it is consistent with the OE you need. 3.Stable Transmission: This diagnostic connector is used to replace old, cracked or tired data cable to ensure safe and stable transmission. 4.Premium Material: Truck adapter cord is made of ABS and rubber material, sturdy, strong tensile strength, not easy to break, and durable. 5.Safe and Reliable: With elaborate manufacturing technology, the adapter cord has high performance, do not need to change frequently. Specification: Item Type: Split Diagnostic Cable_x000D_ Material: Rubber + ABS_x000D_ Number of Pins for Female Connector: 6 Pins_x000D_ Number of Pins for Female Connector: 9 Pins_x000D_ Number of Male Connector Pins: 26 Pins_x000D_ OE: 121891, 121721 _x000D_ Application: Connects to all 9 pin diagnostic connectors in cab and Connects to all 6 pin diagnostic connectors in cab_x000D_ For OE 121891-TC: 9 Pin J1939 Type 2 with Tri CAN Communication which connects to all class 7-8 Vehicles including for Freightliner body controllers. The recommended for DataLink connector can supply SAE J1587 J1708 and J1939 communications and the battery voltage. Connects to all 9 pin diagnostic connectors in cab._x000D_ For OE 121721: 6 Pin specifically recommended for SAE J1708 connections and supply the battery voltage. Connects to all 6 pin diagnostic connectors in cab. Works on most 2005 or older vehicles. Note: 1. Please double check the part number of your item, matching information is for reference only._x000D_ 2. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!