The Fleece Performance Common Rail/VP44 Black Nylon Braided Coolant Bypass Hose (Part Number: FPE-CLNTBYPS-HS-CRVP-BLK) is a high-quality upgrade designed specifically for 1998.5–2018 Cummins 5.9L and 6.7L diesel engines. Engineered to improve coolant flow and reduce pressure buildup behind the cylinder head, this hose is a key component in enhancing engine reliability and temperature control, especially under heavy-duty or performance conditions. Featuring a durable black nylon braided exterior, the hose offers superior abrasion resistance and long-lasting performance, even in extreme engine bay environments. Compatible with both VP44 and Common Rail applications, this coolant bypass hose ensures a secure, leak-free connection and is an ideal choice for Cummins owners looking to extend the life and efficiency of their engine.