I wonder how hard it would be to fit a gauge like this to the stainless (?)
tanks that whichever vendor that is sells ... ?

http://www.blupaxasia.com/blupax/images/products%5Cliquid_level_gauges%5Clevel_gauges%5Clevel_gauges_industrial_mini.jpg

(Hopefully that link will work.)

On Thu, Oct 29, 2015, 14:53 Larry Alofs <lalofs@gmail.com> wrote:

After many experiences with bad caps, including new ones, I continue to
look for a solution.  I hope to retain a tank that is transparent to let me
watch for accumulating air.