Air Box Relief Valve for Porsche 911 (1973-83)
Don't blow a hole in your airbox! Older air cooled motors love to backfire on cold start. With a sticking cold start valve, the backfire pressure can just destroy the whole airbox. This valve instead will give your motor a safe way to get rid of the excess pressure, it opens, then snaps back closed, re-sealing the box.

• Guaranteed Fitment
• 24 Month Unlimited Mileage Warranty
• High Quality Materials
• Replaces leaking OE air box pop-off valve that can reduce vacuum and degrade engine performance
• Manufactured to original valve specifications for easy installation and reliable performance
• Durable high-quality materials withstand high temperatures and rapid vacuum fluctuations

Replaces: 911 110 904 WO,911110904WO