Gates 31508 Radiator Cap

Gates Safety Release Radiator Cap 31508

The Gates Safety Release Radiator Cap 31508 is a direct-fit cooling system cap with a 7 psi pressure rating and a cam-on attachment style. It is built with stainless steel, plastic, and rubber components to provide a secure seal for classic vehicle cooling systems, including applications such as Ford F-100, Chevrolet Corvette, and Toyota Corolla.

Key Features

• Safety release lever helps vent steam through the overflow tube before the cap is fully removed
• 7 psi pressure rating with SAE pressure range of 6-8 psi
• Cam-on attachment type for listed radiator filler necks
• Stainless steel cap finish with silver color
• Vented design with quick pressure release
• OE Exact comparison rating for direct replacement use
• Compatible with optional coolant recovery system applications
• Part number 31508 for easy identification

Product Details

Gates 31508 is a Safety Release Radiator Cap designed for older cooling systems that use a 1.61 in. / 41 mm filler neck inside diameter and a 2.13 in. / 54 mm outside diameter. The cap measures 2.25 in. wide, 1.48 in. high, and 1.48 in. deep, with a shell diameter of 2.61 in. The release lever adds a practical safety feature by allowing pressure to escape through the overflow tube, reducing the risk of burns during service. This Gates radiator cap is a direct OE-style replacement for classic Ford, Chevrolet, Jeep, Chrysler, Oldsmobile, Pontiac, Buick, Dodge, and Toyota cooling system applications.

This part cross-references Dorman - HELP 46013 and Wix 33012 for the same application.

What It Helps Solve

• Coolant loss caused by a worn or weak radiator cap seal
• Steam release issues during radiator service on hot engines
• Pressure retention problems in low-pressure classic cooling systems
• Fitment concerns on cam-on filler neck radiator openings
• Replacement needs for aging OE-style radiator caps

Installation Notes and Tips

Verify the filler neck dimensions before installation, including the 1.61 in. inside diameter and 2.13 in. outside diameter listed for this cap. Confirm the system calls for a 7 psi cap and check whether the vehicle uses an optional coolant recovery system. For fitment examples, this part fits 1957-1965 Ford F-100, 1957-1962 Chevrolet Corvette, and 1969-1974 Toyota Corolla, all in N/A position applications. Additional listed coverage includes 1959 Chevrolet El Camino, 1959-1962 Jeep CJ5, and 1955-1956 Chrysler 300 with application notes. Part number 31508 should be matched to the radiator neck style and pressure specification before service.

Quality Assurance

Gates supplies OE Exact radiator cap coverage for a wide range of classic vehicles, and the 31508 follows the specified pressure and dimensional requirements for listed applications. The stainless steel cap finish, vented construction, and quick pressure release design support consistent service in vintage cooling systems.