Thanks for the info. Very helpful.

I'd like to understand before I buy- this valve (the 5404- I assume the same as the one you are referring to?) says it is good for pressures up to 50 bar. I thought the fire extinguishers produced about 60-70 bar? Am I being stupid here?

(link to valve: http://www.buerkert.com/COM/buerkert...e=5404&sk_id=2)