Nitrous Optimization Part 2 - Go, Baby, Go! Photo Gallery
16 The purge is basically a valve in front of the nitrous solenoid that allows you to clear the system of any excess air, ensuring there’s nothing but nitrous in the line. To do this, install an inline fitting at the nitrous solenoid. The line coming off the fitting goes to a separate solenoid that opens when you hit the purge button.