Larry Jaques wrote:
Given the potential risk, I can see why.
https://www.youtube.com/watch?v=0fWBINa7cxI
https://www.youtube.com/watch?v=Zt3AV9uO0_Q
https://www.youtube.com/watch?v=UwX5NqhEzbc
https://www.youtube.com/watch?v=S72IbsVoczM

I must respectfully disagree. A little soapy water
or a reasonably sensitive nose is enough to forestall
problems. The last video, of the plumber's van, is
the only relevant example and clearly he didn't check
for leaks.

Thanks for the links!

bob prohaska