Fangrui Product Details 1. [high Performance] Specially Designed To Help You Lower The Coolant Temperature At The Rear Cylinders Of Your Truck, Prevents Damaging Coolant Pressure Build Up And Ensures The Consistent Temperatures Across All Cylinders. 2. [easy Installation] Complete Kit Comes With An O-ring Fittings And An Hose Connections With Braided Hose To A Leak Free Installation. Professional Installation Is Highly Recommended, No Instruction Included. 3. [must Kit] One Of The Biggest Issues On The 24 Valves Is The Coolant Flow Problem To The Rear Cylinders. This Can Cause Catastrophic Failure Or Blow Outs Of The Freeze Plugs In An Over-temperature / Over-pressure Condition. Can Effectively Help The Possibility Of Scored Rear Cylinders And Blown Freeze Plugs For Your 6.7 With This Coolant Bypass Kit, Improves The Reliability And For Platform. 4. [superior Quality] Made Of Premium Aluminum And Solid Steel With A Black Anodized . High-quality An O-ring Fittings And An Hose(coolant Hose Braiding - Stainless Steel)