Genuine 25940-R40-000 Automatic Transmission Fluid Cooler Pipe D (ATF)

The Genuine 25940-R40-000 is an OEM automatic transmission fluid (ATF) cooler pipe, also designated as Pipe D (ATF), designed for Honda and Acura vehicles with 2.4L engines. This metal pipe is a critical component of the transmission cooling system, providing a hardline connection between the automatic transmission and the ATF cooler integrated into the radiator.

Key Features:

• Genuine Honda/Acura OEM part ensuring exact fit and proper function
• Durable metal construction designed to withstand transmission fluid pressure and temperature
• Precision-engineered to meet strict factory specifications for proper ATF flow
• Direct replacement for worn, rusted, or leaking original cooler pipes
• Includes necessary fittings for secure connection to transmission cooling system
• Manufactured to Honda's quality standards for reliable long-term performance

This cooler pipe plays an essential role in maintaining proper transmission operating temperatures by circulating ATF through the radiator's integrated cooler section. Replacing deteriorated or leaking transmission cooler lines is critical to prevent fluid loss and potential transmission damage. Over time, these metal pipes can develop corrosion or rust, particularly in harsh climates, making regular inspection and timely replacement important for transmission longevity.