SLIM Big Diver's Alert Marker, 6.0' long (~1.80 meter), Duck Valve with Open Bottom, No-Lock LP Connector with OPV (~12 kg lift)Product Description This OMS 6 foot 1. 8 meter SMB is designed with an open bottom allowing the diver to inflate it using the using the second stage of a regulator or other methods. This SMB is a standard piece of gear for divers performing drift or decompression dives. Features: Easily inflated at depth Extreme visibility Maximum size available in the OMS SMB line up Before using this equipment, divers are recommended to seek instruction under the