21517-4JM1A Coolant Radiator Filler Neck Filling with Cap For Navara SL ST P4X King 2015-2021 Terra The 21517-4JM1A Coolant Radiator Filler Neck is designed for use with Navara models from 2015 to 2021, including SL, ST, P4X, King, and Terra variants.It serves as a direct replacement for the , compatibility with the engine coolant filler neck system.Constructed from ABS plastic, this component is built to resist temperatures and maintain structural integrity under normal operating s. The filler neck features a sealed design that helps prevent coolant leakage and maintains system pressure.It includes a cap to secure the coolant within the reservoir, integrating into the vehicle's cooling system.The unit has a compact profile and lightweight build, allowing for unobtrusive installation in the engine compartment. Dimensions are engineered to match the specifications, providing a fit without the need for modifications.Installation is straightforward and does not require special tools.This part is intended for use in applications where the OEM number 21517-4JM1A is specified. This is an independent replacement component.References to s or models are solely for compatibility indication.