A well designed bubbler is important
Ive made several version using different plastics and things , and have small bits of plastic littering my shed to prove it
I have been testing using the smallest welding tip I had (#2), which runs ok for a while but is too big for continuous running on my current units, hence the flashbacks.
My new bubbler is using 1 3/4" galv tube, with a 1 1/2" (inlet) automotive overboost valve (think it actuates at approx 10-12 psi in normal operation)
which should make for a nice automatic reset, bubbler
pics here:
<http://oupower.com/index.php?dir=_Other_Peoples_Projects/adam666/Hydrogen/Bubbler>
comments welcomed
cheers
Adam