Quote Originally Posted by Supercharged111 View Post
I believe only AFFF expires, but halon is good as long as it's full. Please correct me if I'm wrong.
AFFF doesn't expire. There is no "service date" since you fill it yourself. I would hightly recommend you top it off with distilled water every season to combat what will evaporate thru the threads... Case in point... mine was EMPTY when I took it out of the #67 and it was not touched for at least 5 years...