is because something is on my nos tank and i need to take it out
my main question is what the hell is it exactly? how could something even get inside, considering the size of the valve? check out your yellow pages and see if there’s a welding supply shop in your area. a lot of the independent ones deal with other stuff like Co2 and nitrous, they can probably help you out considering that a nitrous tank isn’t much different from your average welding tank.
go to a nos dealer and talk to them.