Hi Dave: The check valves you spoke of which according to
your supplier actually increase the danger of flashback,
these would not be one-way valves would they? I have always
identified one-way valves as “flashback arresters”. Wrong?
I agree with this. In fact, many of the valve packages call them, Anti
Flash or FlashBack valves.
John Dach and Cynthia Thomas
a div. of The thirst for knowledge,
MidLife Crisis Enterprises like that for water
PO BX 44 must be slaked.
Philo, CA 95466