As I read the article, there is a spring loaded steel ball, that acts as a
check valve. Propane can come out. But, you need a strong magnet to get
propane to go in.

Christopher A. Young
Learn more about Jesus
www.lds.org
..

wrote in message
...

If these valves do not comply to being filled, how can they comply to be
used with standard LP appliances? The threads must be the same, or the
tanks are worthless for standard use. As long as the filler can attach
their filling equipment to these threads, why can they not fill the
tanks?