AP Diving SMB - Self Sealing Black Skirt Masks Over pressure relief valve with

Over pressure relief valve with pull dump at the base

Halcyon developed the Cinch specifically to save divers time and effort when sizing

knurled lockdown screw facilitates simple operation

This top traps an insulating layer of air next to your skin

Innovative apnea timer for free diving

AP Diving SMB - Self Sealing Black Skirt Masks Over pressure relief valve withAP Diving SMB Self Sealing The self sealing AP Diving SMB is inflated by simply purging a second stage in the open end when underwater. The really clever bit is in the mouth where the unique self sealing baffle or duckbill valve is forced shut, forming an airtight seal, on inflation. This self sealing SMB also features a stream lining flap which folds back over the mouth and prevents any sea anchor drag effect when used in a current. The AP Diving SMB