Air Box Pop-Off Valve


Air Box Pop-Off Valve

Reviews & Ratings

Air box pop-off valve. Prevents air box damage from backfiring.

Fitted inside the standard air box, the pop-off valve, which is also called a backfire protection valve, is a good modification for 911's with the Continuous Injection System (CIS). In the event of a backfire, which is not uncommon with these cars, the pop-off valve will release the pressure which can crack and damage the airbox.

Drilling of the air box is required, instructions included.

- 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

To fit:
911 08/1973-07-1983 (vehicles fitted with CIS Continuous Injection System)

$35.50 $35.50
Only 2 Available
URO Parts


This product, and the activities for which this product is intended (including operation, servicing and maintenance of a passenger vehicle or off-road vehicle) can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

Product Information

Product Attributes
Brand URO Parts
Quality Good Quality
Supplier code URO-004104
Standard or Upgrade Upgrade
Unit of sale Each

Fits Vehicles

Product Vehicle Years
911 1974 - 1989