Review on ACDelco GM OE GT264 Locking Quarter Turn Fuel Tank Cap - Includes 2 Keys, Black by Kevin Parker

This is the closest thing to a gas valve with a factory shut off (bought on a 2004 Chevy Silverado LT). It works perfectly, and since my truck is parked in my driveway instead of in the garage, I have peace of mind. Be sure to look at how the gas cap threads are arranged before purchasing this one as I looked at another cap before I got it right. Mine is unthreaded. I highly recommend this product.