Over Pressure Valveallows expanding air to escape during ascent to prevent damage but will keep the dSMB rigid so it stands proud on the surface.
Spring Loaded Inflation Valvehas the same fitting as most BCD and Drysuit inflators and only requires a quick blast of air that will expand to fill the dSMB at the surface. The Valve can also be orally inflated if required.
Bungee Cord Loopkeeps the dSMB wrapped up neatly when not in use without the need for bulky Velcro Straps.
Simple Metal D-Ringallows for quick and easy attachment to any line or bolt snap
How to inflate
Two ways to inflate you can either use the metal inflator to orally inflate or use a QD hose from your BCD or drysuit. The bottom is open-ended so you can use your exhaust or octo to inflate and the expanding gas inside will close it so it won't deflate when it hits the surface.