Four Seasons 26780 A/C System Valve Core and Cap Kit

AC System Seal Kit for R12 and R134a

Four Seasons AC System Seal Kit 26780 is a cap and valve core kit for servicing A/C system service ports. It is built with an aluminum body and plastic caps in red, blue, and black, with application coverage for R12 and R134a refrigerant systems. This Four Seasons AC System Seal Kit 26780 is a practical replacement for worn, damaged, or missing service port components on a wide range of Ford, Lincoln, Mercury, Mazda, and select GM and Toyota vehicles.

Key Features

• Part type: A/C system valve core and cap kit
• Style: cap and valve kit for HVAC service ports
• Refrigerant types: R12 and R134a
• Aluminum construction with plastic caps
• Cap colors: red, blue, and black
• Direct reference part number: 26780

Product Details

Four Seasons AC System Seal Kit 26780 is designed around service-port sealing needs for automotive air conditioning systems. The cap and valve core format helps restore the sealing interface at the A/C service ports, while the material selection supports common underhood HVAC service conditions. This part is listed for a broad range of vehicles, including Fits 2012 Ford Focus, N/A; Fits 2012 Ford Transit Connect, N/A; Fits 2013 Lincoln MKT, N/A; and many earlier Ford, Lincoln, Mercury, Mazda, GMC, Chevrolet, Plymouth, and Toyota applications. For shoppers searching by vehicle, this kit is commonly referenced for Ford F-150, Ford Explorer, and Mazda B-series A/C service port repair needs.

This part cross-references Monroe Shocks & Struts (e.g., 801803) for the same application.

Common Uses

• Replacing cracked or missing A/C service port caps
• Restoring valve core sealing at refrigerant service points
• Addressing slow refrigerant loss from worn service-port components
• Repairing damaged cap threads or deteriorated port seals
• Servicing R134a and R12 A/C systems on listed Ford, Lincoln, Mercury, and Mazda models

Installation Notes

Verify the service-port style and refrigerant type before installation. Clean the port area before replacing the cap and valve core components, and confirm the cap seats fully without cross-threading. For best results, compare the original service port configuration on the vehicle with the product listing before ordering. This kit is listed for numerous Ford Focus, Ford Transit Connect, Ford F-150, Lincoln Town Car, and Mazda B3000 applications, so matching the exact model year is important.

Quality Assurance

Four Seasons is a recognized HVAC parts brand with broad coverage in automotive air conditioning service components. Part number 26780 is cataloged as an AC System Seal Kit for listed applications and is intended to meet the fitment and material specifications shown above.