Rescue Marker Model Number TA1102 The TUSA Rescue marker and SMB surface marker buoy is an invaluable tool for any diver no matter your experience An SMB shows that a diver is down and alerts the surface exactly where you are in the water Safety tube that inflates with regulator air Check valve prevents air from escaping Inflator Deflator valve for easy operation Dimension L x W 71  5 in 1800  135 mm