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The Gates reservoir lower straight heater hose for 2020–2021 Freightliner Cascadia with Detroit Diesel DD13 is a direct replacement for the lower reservoir‑to‑heater line. Its straight profile is intended to match factory routing and connection points on the DD13 applications, restoring proper coolant return flow and reservoir linkage in the heater system.
Gates 20-21 Freightliner Cascadia Detroit Diesel DD13 Diesel Reservoir Lower Straight Heater Hose
