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A real gem of a product, the 1.4m x 20cm wide orange sausage shaped SMBC was developed in the early 1990s and quickly became a standard part of most divers kit.
The SMBC is simply inflated by purging a regulator or air gun in the open end. The really clever bit is in the mouth, where a unique self-sealing baffle or duckbill valve is forced shut forming an airtight seal on inflation and preventing the buoy from accidentally deflating on the surface.