Merryterry wrote:
One could say the same thing about shower pipes. But the fact that
you sell "approved" hoses makes me think you may be biased.

Yes, I am biased, in the same sense that a Corgi Registered Plumber
suggests to you that a non Corgi plumber can harm your well being.
Result: you disregard his warning because you think he is biased. Your
family gets blown up or gets CO2 poisoning.

carbon dioxide poisoning ? nah, di-hydrogen monoxide is the real threat.