Genuine Nissan upper radiator pipe (filler neck assembly) designed for Navara D23 NP300 models fitted with the YS23 2.3L diesel engine. This component forms part of the radiator top section where the radiator cap is fitted and coolant is filled and pressurised.

It is a direct OEM replacement for cracked, leaking, or damaged filler neck housings, helping restore correct cooling system function.

Features & Benefits

Features

• Genuine Nissan OEM part
• Part number: 21517-4JM1A
• Upper radiator pipe / filler neck assembly
• Direct factory replacement fit
• Suits Nissan Navara D23 NP300
• Compatible with YS23 2.3L diesel engine variants
• Designed for radiator cap mounting and coolant fill point
• Plastic OEM construction

Benefits

• Helps maintain correct coolant system pressure
• Reduces risk of coolant leaks at radiator neck
• Direct replacement for damaged factory unit
• Supports stable engine operating temperature
• Restores proper radiator cap sealing
• Suitable for cooling system repair or service work

Vehicle Compatibility

Suitable for:

• Nissan Navara D23 NP300
• YS23 2.3L twin turbo diesel variants
• Selected models from approx. 2015 onwards (variant dependent)

VIN confirmation recommended due to multiple cooling system configurations.

Specifications

• Brand: Nissan Genuine Parts
• Part Number: 21517-4JM1A
• Product Type: Upper Radiator Pipe / Filler Neck
• Material: Plastic (OEM specification)
• Condition: New

Package Includes

• 1 x Genuine Nissan Upper Radiator Pipe 21517-4JM1A