Genuine Bosch high-pressure connector tube for the 6.7L Cummins . This is the steel tube that carries fuel from the rail, through the cylinder head, into the injector, sealing metal-to-metal at both ends. Six are required per engine , one per cylinder. Fitment Bosch lists this one connector across the entire 6.7L Ram range, pickup and cab & chassis: Ram 2500 & 3500 pickup, 2007.5–2018 — injectors 0986435518 and 0986435621 Ram cab & chassis 3500/4500/5500, 2007–2018 — injectors 0986435519, 0986435574, 0986435573 Cab & chassis does not take a different tube from the pickup. This is a common misconception. This tube does not fit the 5.9L. For 2003–2007 5.9L Cummins you need Bosch F00RJ01572. Replaces these part numbers Cummins 4929864 · Cummins 4929865 · Cummins 2872286 · Cummins 2872288 · Cummins 2872395 · Cummins 3947539 · Cummins 3975393 · Cummins 3976656 · Cummins 4088576 · Mopar 5175565AA · Mopar 5175565AB · Mopar 5175565AC · Mopar 68005335AA · Mopar 68441874AA · Mopar 68444832AA · Mopar 68460261AA · Mopar 68568035AA · Bosch F00RJ01831 Why it has to be replaced The sealing tip of a connector tube deforms slightly under torque and takes a permanent impression from the injector it was clamped against. Fit that tube to a new injector and the impression no longer matches, which leaves a leak path at the highest-pressure point in the fuel system. Bosch and Alliant Power both specify replacing all six every time injectors are serviced. A tube can look perfect and still be finished. What is worn out is a shape you cannot see. Symptoms of a failed connector tube Fuel in the valve cover — the most common sign Rising oil level and a diesel smell on the dipstick as fuel dilutes the oil Hard starting, particularly when hot A miss on one cylinder that follows the tube rather than the injector Raw diesel smell after a hard pull with no visible external leak Warranty and shipping Valley Fuel Injection has been a Bosch factory-authorized diesel service center since 1993. We ship nationwide from Woodland, California, typically within 1–2 business days. See our warranty terms and shipping policy . Not sure which tube your engine takes? Call (530) 668-0818 with the year and application and we will confirm it.