[Buckeye]

Take some vasoline and spread it all over the o-ring, it helps a great deal.
I put a rather large amount all around the seals on mine.

My Dewar is a low pressure type, yours might be a high pressure type. High pressure types build up pressure very fast.

Some pictures would be great.

Is it like this one ?

http://www.bid-on-equipment.com/detail~id~51551.htm

[Chuchnit]

Originally Posted by Buckeye

Take some vasoline and spread it all over the o-ring, it helps a great deal.
I put a rather large amount all around the seals on mine.

My Dewar is a low pressure type, yours might be a high pressure type. High pressure types build up pressure very fast.

Some pictures would be great.

Is it like this one ?

http://www.bid-on-equipment.com/detail~id~51551.htm

It looks identical to that minus the extension on the withdrawl hose. Plus mine is green. It is rather old. I was thinking about taking apart the valve and inspecting the orings tomorrow. Man I really want to use this thing this weekend at the latest.