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I've got a circa 1960's USD FFM, that has an internal mouthpiece that sounds
similar to the one described by John. Replacing the regulator is a snap, and Co2
buildup is minimized by the mouthpiece. The thing is huge, however, weighs alot
and really gives you tunnel vision. No com ports either, of course. The thing
is more of a relic than a useful mask, although it was led the way for a good
idea.
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> Going through an old box of diving gear I came across a Cressi Sub full
> face mask that my father had used, that was it. This mask has an oriface
> that a regulator mouth piece or a rebreather mouthpiece nipple can fit
> through and then the rubber mouth piece that goes in your mouth can be
> attached inside the mask, therefor when you put the mask on your lips seal
> around it and the hydrostatic pressure no longer goes into the mask but
> into your mouth, just as if you had a half mask on with a standard
> rebreather mouthpiece. The CS FFM also seals way under your chin. If it
> leaks a little water in you clear it the same way you do a half mask.
One cool thing about the CS FFM is its price, 50 bucks. The only draw back
> is com gear, there is no port for com gear. I understand there are a few
> more masks on the market with the same configuration, Scuba Pro and US
> Divers makes one, maybe they're mask has a com port.
>
> At 200 feet I let my jaw go slack just as if I had passed out and I could
> still breathe. I closed the surface valve on my mouth piece took off the
> mask underwater, put it back on, cleared it, opened the valve and I was
> good to go. Simple and cheap.
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