Automatic trigger device for inflatable vests Simi 150N. Coded Description Unit 04328-1 Micro Manual Inflator "D" Hole Unit 04328-1-1 Micro Manual Inflator "O" Hole Unit 04328-2 Automatic Inflator μκ5 "D" Hole Unit 04328-2-1 Automatic Inflator μκ5 "o" Hole Unit 04328-2Pro Automatic Inflator Pro Elite "O" Hole Unit -