Mr P

mAke sure the purge works all the time, the reason for this is you need a ball valve in the car. You open the valve right after the burnout and close it on the return road. After closing you want to purge the line so there is no load on the plungers in the nitrous solenoids. this makes the plungers last a lot longer and they are designed that the nitrous goes behind them and keeps them on the seat. If you have the ball valve in the car you are only loading the plunger for 10-30 seconds depending on how fast the car is and how fast you close the valve...Thats a lot better than having the bottle on and there is pressure on them for hour or more, in the lanes driving back etc