Dorman 911-170 Secondary Air Injection Check Valve - Right

Reliable Secondary Air Injection Check Valve for Subaru Vehicles

The Dorman 911-170 Secondary Air Injection Check Valve is engineered to maintain optimal emission control in select Subaru models. Designed with durable cast aluminum and a precise valve mechanism, this part supports efficient air injection system performance in the Forester, Impreza, and WRX STI.

• Constructed from cast aluminum for strength and corrosion resistance
• Black and silver finish for durability and visual inspection
• 1 inch inlet and 0.5 inch outlet sizes for exact fitment
• Maximum pressure rating of 15 psi to handle system demands
• Operates reliably within a temperature range of -40°C to 125°C
• Includes one secondary air injection check valve and one gasket for installation
• Check valve type designed to prevent backflow in the air injection system

Durable Design and Precise Fitment for Subaru Emission Systems

The Dorman 911-170 is specifically designed for Subaru Forester, Impreza, and WRX STI models, ensuring compatibility with their secondary air injection systems. The cast aluminum construction offers resistance to heat and corrosion, critical for emission control components exposed to harsh engine conditions. The valve’s inlet and outlet sizes match factory specifications, allowing for straightforward replacement without modification. Its pressure rating of 15 psi supports the air injection system’s operational requirements, while the included gasket ensures a secure, leak-free installation.

Purpose and Common Issues Addressed

• Prevents exhaust gas backflow to maintain emission system efficiency
• Helps reduce harmful emissions by supporting secondary air injection
• Resolves check valve failure symptoms such as engine warning lights or failed emissions tests
• Eliminates air injection system leaks that can cause rough idling or poor engine performance
• Restores proper air flow to the catalytic converter for cleaner exhaust output

Installation Notes and Tips

• Ensure the engine is cool before beginning installation to avoid injury
• Use the included gasket to prevent air leaks and ensure a tight seal
• Verify inlet and outlet orientation matches the original valve for correct airflow direction
• Inspect surrounding hoses and connections for wear or damage during replacement
• Tighten fittings to manufacturer torque specifications to avoid damage or leaks

Quality Assurance and Warranty Information

Dorman manufactures the 911-170 Secondary Air Injection Check Valve to meet or exceed OEM standards for fit, form, and function. The part undergoes rigorous quality control to ensure durability and reliable operation within the specified temperature and pressure ranges. This product is backed by Dorman’s limited warranty, providing coverage against defects in materials and workmanship under normal use.