Hi Matej ,

The pressure will not hurt the o-ring over any reasonable period. Obviously 
part of general care is to replace them periodically but this is more from 
wear than from pressure. The sideways o-ring is a complete waste of time 
and actually just gets in the way. To demonstrate the useless nature of 
this 0-ring merely remove the face seal o-ring and go diving. The problem 
is that it will occasionally catch on the cannister and cause the light to 
leak.

Best,
JJ

  At 08:51 AM 10/2/2000 +0200, you wrote:
With some friends we have been watching the Main O-ring on EE canister 
lights. The latches are used only to seal the light on the surface, later 
on the water pressure takes over... But this can mean 500 kg force on 100 m 
depth. Is that good for the O-ring. Why is the seat (recess) for O-ring 
made that way to protect the O-ring from these excessive forces? Sure if 
the O-ring is pressed by 50 kg it would seal enough, so there is no need 
for the O-ring to be loaded by 500...
Would another O-ring that would seal sideways not only one frontal do any 
good (if the first one leaks)? Why not.
I am sure there is a reason behind it all and obviously it works great, I 
would just like to understand the reasoning behind it. I think it is not 
only cost related....

Thank you
Matej SImonic

Jarrod Jablonski

President-
Global Underwater Explorers www.gue.com
CEO Extreme Exposure www.extreme-exposure.com

Global Underwater Explorers www.gue.com
GUE is a non-profit educational, research, and exploratory organization 
with hundreds of dedicated members around the world.

Extreme Exposure www.extreme-exposure.com
Extreme Exposure and Halcyon manufacturing produce some of the scuba 
industry's most novel and robust diving equipment designed by many of 
diving's most active explorers.



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