Apeks Bailout Switch BlockThe Bailout Switch Block allows the diver to switch from a primary gas supply to an alternate bailout gas supply (Emergency Gas Supply EGS). The Switch Block is used with any diving helmet or full face mask with a medium or low pressure gas supply. Key Features Robust, durable and reliable User friendly configuration and operation All ports marked for easy identification Use with surface supply umbilical or Scuba cylinder CE Approved to standard