Thank you for all the wonderfull information so far.
I myself and I am sure, others too, are learning a lot about this strange and unusual Demone Demon Regulator. On books, I have several. But now, I better buy Fred Robert's Basic Scuba book too. I think there were 2 of those and I had No idea it had such great information about the Demone in it. Thank you for telling me. . >>---> I am very happy I did make my new thread here at the correct place. From now on,
I will try to do this like everyone else is doing theirs and also do it properly. I should have mentioned that the Demone Demon Regulator I was just offered did not have an exact price yet. They said that the last couple of these Demone regulators that sold on eBay auction sold for over $1,000 to over $1,200 each. If the owner decides to sell his on eBay, then they will have a $1,000 to $1,200 Reserve Price on it. If they sell outright to someone, then the offer will need to be close to the actual Value. But what could the true value range be? Even if in excellent working condition I do not agree with such a high stated value. I just do not understand it. It is no work of art. Not even having a Demon Decal on the Regulator's mouthpiece was a marketiong mistake to me. No one I have found yet, can rebuild one, much less even make a Repair to one. To me, this one that is Free-Flowing Air, just can not be worth more than $300 to $500 at the very most. But that is just my uneducated and really naieve opinion and not the true facts about it's value. If it really was worth a great amount of money, like they said it was, in the cosmetically great but non-operateing condition, I hope someone else will help and tell us the actual value range. Thank you
I am not positive that I am in the right area for this posting but think maybe it is. I am trying to find out important things about the very strange Demone Double Hose Regulator. I have checked with only a few people so far and the findings do not look very good. No one that anyone has heard of has been successfull in repair rebuilds, at least that they have heard of. One friend, who was trying very hard to rebuild his Demone even went to see the inventer and builder of it, but the man had passed away something ike 6 months prior. I am being offered this Demone double hose that is excellent Cosmetically and even has excellent soft rubber hose and mouthpiece. But it is Free-Flowing Air at this time. It will need to be repaired in order to be safe to dive with. If anyone knows anything, good information and knowledge about the Demone Double Hose Regulator, I and many others I am thinking, would be very gratefull to you for your help in learning about the strange Demone Regulator. Do you know of anyone who might be able to Repair it or even Rebuild it? Are there any diagrams/ blue prints or any drawings at all of it's internal parts and workings? I have been told that the 2nd Stage in the metal mouthpiece has Two Tilt Valves in it's design, makeing repair and rebuilds extremely difficult. Thank you. 
