The HighLand Inline Shut Off at Second Stage installs between standard regulator hose and second stage. The Inline Shut Off at Second Stage has 9/16-18 UNF male inlet to 9/16-18 UNF female outlet threads (standard regulator threads).

n• Can be installed on any 2nd stage and allows instant stopage of    airflow through hose• Provides complete protection from an octopus free flow  while diving• Ideal for decompression bottles or stage bottles where   preventing gas loss is critical