Howard, This fstbttms guy either sells this type of equipment and your idea is cutting into his profits or already spent way too much for his set up and now wants to not feel like a jerk for doing so. There is no difference between the rubber used in real diving hose and oxygen hose. I would however start with new hose so as not to worry about what may have been passed through it before. I am still not sure what you mean by "food grade hose" but if it is what I think it is you may want to stick with something more durable that also has a higher working pressure.
Food Grade means it's safe to come into contact with food. Like the lubricants you probably use on your helmet's orings on the neck dam or other parts on dive helmets or scuba regulators that are not for oxygen service. (Like Dow Corning 111 Oring Silicone Lubricant is "food grade" approved by the FDA and NSF)
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Just so I'm making my statement clear, and not to sound cavalier about the whole hose issue.
I am not for a moment suggesting that ANY hose will do. The hose required must be properly pressure rated, and have adequate couplings on the ends to handle the pressure. Plastic hose with a low PSI rating and some worm drive clamps to hold the fittings on the end are by no means what I am suggesting. I am just replying to the Grade E hose which is certainly not required by any means. Hose that is approved for coming into contact with humans IS definitely required though.
If we were going to live our lives based on military specifications, I'd have a $1,000,000 toilet in my apartment. Right?
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