Mahalo... Renman... If I remember correctly...and don't hold me to this, some of our more educated guys can answer better... but I think Kelso was the consultant ON the standards and they were directly involved in determining what they should be, ie, their valves. I also think that their valves tested at HIGHER levels than will be required. Like I said, I believe this to be the case but please, someone else who knows, fill us in on the numbers, Aloha, Flyboy