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The breathing bag is square with rounded corners, on his chest, exposed. Its absorbent canister is cylindrical with flat ends, crosswise on his belly, in a rubber sheath. It has a loop of wide corrugated breathing tubes; one of them originates at each end of the canister; the right tube has a side connection to let gas in and out of the breathing bag as he breathes. It has two long thin oxygen cylinders lengthwise on his back. It can be supplied with a mouthpiece with a neck strap; the mouthpiece has a valve on its front to close the breathing tubes when the mouthpiece is not in his mouth. Its dive duration is about 3 hours.
It has a nitrox variant called ONBA.
- http://www.therebreathersite.nl/Zuurstofrebreathers/English/life_support_sdba_mk5.htm description
- http://www.therebreathersite.nl/Zuurstofrebreathers/English/photos_sdba_mk5.htm images
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