Four Seasons 26775 A/C System Valve Core and Cap Kit

AC System Seal Kit for GM A/C Service

Restore a tighter seal at the service ports with the Four Seasons AC System Seal Kit, Part Number 26775. This cap and valve kit is built for R12 and R134a refrigerant systems and uses an aluminum body with black plastic caps for a clean, service-ready finish.

Compatible With Chevrolet Silverado 1500, GMC Sierra, Buick Enclave, and many other GM vehicles across model years 1993-2015, this kit is a direct-fit solution for A/C system valve core and cap service. Four Seasons 26775 is also cross-referenced to Global Parts Distributors LLC 1311422 for the same application.

Key Features

• Four Seasons AC System Seal Kit, Part Number 26775
• Cap and valve core style A/C system seal kit
• For R12 and R134a refrigerant systems
• Aluminum construction with black plastic caps
• Designed for service-port sealing on GM HVAC systems
• Fits a wide range of Chevrolet, GMC, Buick, Cadillac, Pontiac, Saturn, Hummer, Isuzu, Geo, and Oldsmobile applications

Product Details

The Four Seasons AC System Seal Kit line focuses on sealing the A/C service connection points where valve cores and caps are commonly serviced. Part 26775 is specified as a cap and valve kit with aluminum material, black cap color, and application-specific cap inside diameter and valve core material. It is listed for a broad range of GM platforms, including Chevrolet Silverado 1500, Chevrolet Tahoe, GMC Sierra, Buick LaCrosse, and Cadillac Escalade, making it a practical choice when replacing worn or leaking service-port components.

What It Helps Address

• Refrigerant loss at the A/C service port
• Damaged or worn valve core sealing surfaces
• Missing, cracked, or deteriorated service caps
• Routine A/C maintenance on R12 or R134a systems
• Service-port contamination from exposed fittings

Installation Notes and Tips

Verify refrigerant type and service-port configuration before installation. Match the vehicle application exactly, since fitment varies by model year and A/C system layout. Clean the service area before replacing the cap and valve components, and confirm the cap seats properly after installation. For body fitment, examples include Fits 2014-2015 Chevrolet Silverado 1500, N/A; Fits 2008-2013 Buick Enclave, N/A; and Fits 2009-2013 Cadillac Escalade, N/A.

Quality Assurance

Four Seasons is a recognized HVAC parts brand, and Part 26775 is cataloged for direct application matching across confirmed GM fitments. This part cross-references Global Parts Distributors LLC 1311422 for the same application.