Blue Reef Diver Below Deluxe 6' Signal Tube This 6' long signal tube can be easily stored in a large pocket or clipped out of the way on your BC. When the SMB is inflated it is long enough to be easily seen from a distance and sturdy enough to stand up to any weather conditions you may encounter. It is also conveniently labeled with "Diver Below" so you can send it up to mark your location while making a safety stop. It features aneasy to use oral inflation valve with lock to prevent accidental deflation as well as a larger over pressure / dump valve. This Deluxe model also features a special "No Spill" second stage inflation option for quick and easy inflation from any second stage regulator. Our signal tubes are available in your choice of neon yellow or Hi Viz orange. Don't risk not being seen in an emergency, pick up a Diver Below SMB today.