68364312AC Front Engine Coolant Reservoir Aluminium Fit For 2018+ JL & 2020+ JT 2.0&3.6L OEM Number: 68364312AC, 68364312AA, 68364312AB, 68388115AB Application: For 2018, 2019, 2020, 2021, 2022, 2023, 2024 JL and for 2020, 2021, 2022, 2023, 2024 JT 2.0T & 3.6L models Design: Compatible with OEM installation position and OEM cover.Features a reserved pressure relief hole to prevent overpressure.Constructed from aluminum material for reduced weight and increased pressure resistance.Function: When coolant pressure in the radiator exceeds the pressure cap setting, excess coolant flows through the designated channel to prevent hose rupture, functioning similarly to a car expansion tank.Installation: Uses OEM mounting holes; no cutting required.