Gates 31350 Radiator Cap

Heavy-Duty Radiator Cap for Closed Systems

The Gates Heavy-Duty Radiator Cap 31350 is built for heavy-duty trucks, buses, and tractors using a 3/4 in. deep filler neck. It features a cam-on attachment, vented design, and 15 psi pressure rating for closed cooling systems.

Key Features

• Heavy-Duty B size filler neck cap for 3/4 in. deep filler necks
• 15 psi pressure rating with SAE range of 14-18 psi
• Cam-on attachment for secure fitment
• Vented design for closed coolant recovery systems
• Stainless steel cap finish with stainless steel and rubber construction
• OE Exact comparison rating for OE-style replacement needs
• Fits filler neck inside diameter of 2.13 in. (54 mm) and outside diameter of 2.00 in. (51 mm)

Detailed Description

Gates Heavy-Duty Radiator Caps are engineered for demanding cooling system service in commercial and off-highway equipment. Part number 31350 is a Heavy-Duty B Size Filler Neck Cap with a stainless steel finish, vented construction, and closed-system coolant recovery compatibility. The cam-on design helps secure the cap on the filler neck, while the 15 psi rating supports proper system pressure control. This radiator cap is a direct OE Exact style replacement for applications that require a 3/4 in. deep filler neck and the listed diameter dimensions. This part cross-references Motorad 1006-15 and Wix 33027 for the same application.

What It Helps Address

• Loss of cooling system pressure from a worn or weak radiator cap
• Coolant overflow or improper recovery in a closed system
• Seal issues at the filler neck caused by aging rubber components
• Fitment problems on heavy-duty trucks, buses, and tractors with the specified neck dimensions
• Cooling system service needs on heavy-duty Ford F-Series, Chevrolet Silverado, and GMC Sierra applications where this cap specification is required

Installation Notes and Tips

Confirm filler neck depth, inside diameter, and outside diameter before installation. This cap is specified for a 3/4 in. deep filler neck and a cam-on attachment style. Inspect the radiator neck and sealing surfaces for corrosion, debris, or damage before installing the cap. Verify that the cooling system uses a closed coolant recovery setup and that the pressure rating matches the vehicle or equipment specification. Fits 2006-2011 Honda Civic, front right is not applicable here; use the listed heavy-duty cooling system dimensions instead. Fits heavy-duty truck, bus, and tractor applications requiring Gates 31350.

Quality Assurance

Gates identifies this cap as an OE Exact replacement style, with stainless steel and rubber construction selected for heavy-duty cooling system service. Part number 31350 is built to match the specified filler neck dimensions and pressure requirements for the intended application.