Stant 12021 Radiator Cap Adapter

Radiator Cap Adapter for Cooling System Testing

The Stant 12021 radiator cap adapter is made for use with the Stant 12270 pressure tester and includes a seal for a secure connection during cooling system checks. Built from durable material, it supports accurate radiator cap and cooling system pressure testing across a wide range of Asian and domestic vehicles.

For technicians searching for a radiator cap/cooling system tester adapter for Hyundai Elantra, Nissan Altima, or Kia Sorento applications, this adapter helps connect the tester to the correct cap style for pressure diagnosis. Stant 12021 is a service tool component used in professional cooling system testing.

Key Features

• Radiator cap adapter for cooling system pressure testing
• Made for use with the Stant 12270 pressure tester
• Durable construction for shop and service use
• Includes seal for proper tester connection
• Supports fitment across many Hyundai, Kia, Nissan, INFINITI, Mazda, Subaru, Toyota, and Ford applications
• Part number: 12021

Product Details

This Stant radiator cap adapter is part of the Radiator Cap/Cooling System Tester Adapter line and is built to interface with the Stant 12270 pressure tester. It is used when checking cooling system pressure, radiator cap sealing, and related leak concerns on vehicles such as the Hyundai Sonata, Nissan Frontier, and Mazda CX-9. The adapter’s seal helps maintain a proper connection during testing, which is important when diagnosing cooling system performance.

This part cross-references no listed interchange numbers in the provided data. Part number 12021 is the identifier to reference when ordering or matching the correct adapter for the Stant tester setup.

Common Problems It Helps Diagnose

• Radiator cap sealing issues
• Cooling system pressure loss
• External coolant leaks
• Faulty pressure test connections
• Incorrect adapter-to-tester fit during service

Installation Notes and Tips

• Use only with the Stant 12270 pressure tester.
• Verify the vehicle application before testing, especially on models with notes such as early production or specific radiator types.
• Inspect the included seal before each use to confirm a tight connection.
• Follow the pressure tester instructions and vehicle service manual procedures during diagnosis.
• Confirm the adapter is fully seated before applying pressure.

Quality Assurance

Stant manufactures this adapter as a durable service tool component for cooling system testing. Part number 12021 is built for repeated diagnostic use in professional automotive service environments.

Compatible Vehicle Applications

• Fits 1995-2018 Hyundai Elantra, N/A
• Fits 1995-2018 Hyundai Sonata, N/A
• Fits 2001-2018 Hyundai Santa Fe, N/A
• Fits 1995-2018 Nissan Altima, N/A
• Fits 1998-2018 Nissan Frontier, N/A
• Fits 2001-2017 Kia Sorento, N/A
• Fits 2003-2018 Mitsubishi Outlander, N/A
• Fits 2007-2018 Nissan Versa, N/A
• Fits 2007-2015 Mazda CX-9, N/A
• Fits 1995-2014 Subaru Legacy, N/A