Dorman 306-056 Secondary Air Injection Check Valve

Reliable Secondary Air Injection Check Valve for Buick, Chevrolet, and GMC

The Dorman 306-056 Secondary Air Injection Check Valve is designed to maintain proper air flow in the emission control system of select Buick, Chevrolet, and GMC vehicles. Engineered with durable aluminum and plastic materials, this valve supports efficient emission control and helps your vehicle meet environmental standards.

• Constructed from aluminum and plastic for durability and corrosion resistance
• Measures 4.5 inches in length with a mounting hole diameter of 0.48 inches
• Features a single port design with 0.91 inch inlet and 1.7 inch outlet sizes
• Maximum pressure rating of 5 psi ensures reliable operation under typical conditions
• Includes gasket and hardware for secure installation
• Thread diameter of M8 x 1.25 mm for precise fitment
• Available in black and silver finishes

Product Details and Specifications

The Dorman 306-056 is a solenoid-type secondary air injection check valve that plays a critical role in the air injection system by preventing exhaust gases from flowing back into the air pump. Its aluminum and plastic construction balances strength and weight, while the 4.5-inch length and specific port sizes ensure compatibility with the air injection system components. The valve’s maximum pressure rating of 5 psi is suitable for the controlled air flow required in emission control applications. This part is designed specifically for use in Buick Equinox, Chevrolet Impala, Malibu, and GMC Terrain models, among others, ensuring a precise fit and reliable performance.

Compatible Vehicles and Common Applications

• Buick Equinox and LaCrosse secondary air injection system maintenance
• Chevrolet Impala and Malibu emission control repairs
• GMC Terrain and Regal air injection system component replacement
• Addressing issues related to air flow backflow in emission systems
• Restoring proper function to secondary air injection check valves

Installation Notes and Tips

When installing the Dorman 306-056 check valve, ensure the valve orientation matches the air flow direction specified by the vehicle manufacturer. Verify that the mounting hole and thread diameter (M8 x 1.25 mm) align with the existing hardware points. Use the included gasket to prevent air leaks and secure the valve firmly without over-tightening to avoid damage. This valve is not adjustable, so proper fitment and alignment are essential for optimal performance.

Quality Assurance and Warranty Information

Dorman parts are manufactured to meet or exceed OEM standards, providing reliable performance in emission control systems. The 306-056 Secondary Air Injection Check Valve undergoes rigorous quality checks to ensure durability and functionality. Please refer to Dorman’s warranty policy for specific coverage details.