I know this is an old thread, but why not just attach the hose directly to the heat shrink coupled with a ring and just have that already together? Interesting that nobody has ever lived to tell anyone if there is any discomfort or awareness during the actual dying process of this method. I've been contemplating this method for emergency situation where food and water might be scarce in a long term disaster that lasts for years. Its always nice to think one has a peaceful painless way out of any bad situation that has no solution in sight. It all depends on one's tolerances. I'm skeptical of argon and would worry that the convulsive possibilities might disrupt the process because the gas is a bit different at 100% than nitrogen. I like the look of your metre, but am in America with limited options. I have my nitrogen tank, and after watching some videos about the fact its a "sleeping giant" I'm a bit afraid of the liabilities of owning it and what might happen if its ever compromised. If I tried putting myself down in a hotel, and things went wrong, and I survived, what would legally happen for any destruction or mayhem? There is a way one has to attach the metre with care and there are video about the proper way to do this. Any thoughts?