This was used for a short time in my 04 Mach 1 to hold my single din head unit in place. It's never been 'hooked up' to a nitrous system; I sold my system before I got that far. The purge button is spring loaded so you can bump it. It looks like SOS has moved on with other types of production and these are some of the things that are no longer made. It cost $115 to have it made and shipped. I'm asking $100 shipped. It's in excellent condition. If you want pay pal insurance, please add 3%. Thanks for looking!