I know this is going back to early discussions in this topic but I thought this would be of use to those of us like myself who share a love for rubber re-breather bladders.
Firstly I would like to ask what we find appealing about these particular rubber bags, and what we want to gain from using them. Reading all the posts, it seem that a lot of us love the sight of the inflating and deflating cycle of the bladder, and also completing piece of rubber for the truly total enclosure experience. If this is what your after then this will surely help.
The main problem is how long you can safely breathe when this is connected to a gasmask or hood. Without openings you are basically suffocating yourself. This is fine if that is what you want to archive but must add any length of time is dangerous without supervision, which I know we’ve all heard a thousand times, but must be said. Also playing beyond the length of time you can hold you breath for is asking for trouble.
For me it is the sight of your own breath trapped inside a rubber bladder inflating and deflating before your very eyes and the ability to hold and feel your breath in your hands or between your legs over sex without the worry of how long have I got before I pass out? If this is what your after then read on.
I have been servicing all types breathing apparatus for over 10 years and have come across a piece of kit that blew me and my missies away. I first came across it on a service course. I was allowed to put this on firstly to get to know how it worked. I couldn’t believe what I was wearing. It is called the Dragger saver, it’s an emergency escape kit carried by inspectors of drains and other places where a build up of toxic gases could cause a threat. It consists of a plastic hood with a latex rubber neck seal the same type used on diving suits, forming an airtight seal around your head. Inside the hood is an oral nasal mask to help reduce fogging and contains an over pressurisation valve, also attached is a hose feed by an air cylinder giving the wearer 10 minutes of breathing time. As I pulled the bag open the flow of air started. I pulled the hood over my head and positioned the mask over my nose and mouth. As I breathed in the hood started to collapse deflating around my head, which took me by surprise! As I breathed out hood inflated like a big balloon and as it reached its max the overpressure valve vented off the excess air. The experience was like suffocating but without the danger.
I took the research on this product for levels of Co2 and O2 to see if this could be used in the same way with re-breather bladders. A constant flow valve delivering 20 Lts per minute fed the hood, which is enough to allow re-breathing whilst running for 10 minutes and this was on the safe side as Co2 levels and O2 levels hadn’t reached any dangerous levels also this was the amount of air in the cylinder. I then did my own experiments with my gas analyser using a variable constant flow valve attached to a re-breather bladder. At 20 lts per minute. The bladder didn’t deflate that much during inhale and the overpressure valve blew off almost constantly during exhaling. This didn’t produce the effect I was after so I lowered the flow rate to 10 ltrs per minute. This allowed the bladder to fully deflate and on inflation vented off some of the excess air. Using a 2lt bladder at this flow rate kept the O2 levels above 19%, which is considered safe, and the Co2 levels safe for 20 minutes. Another fun thing I like about this method is you can hyperventilate without the usual problems, as you don’t purge you body of Co2. I have used this method of re-breathing for over 6 years on a regular basses and on occasions up to an hour with no ill effects. I would still recommend supervision in all situations when under going breath play, but if you do intend to play alone then this is far the safest.
If anyone wants to know what equipment is needed, where you can purchase it or help in purchasing equipment especially the constant flow valve and cylinder, I’ll gladly help.
Hope this helps