The Auto/Manual 24G Inflatable Re-Arm Kit contains everything necessary to re-arm your Mustang Survival MIT 100 Convertible A/M inflatable PFDs after deployment. The automatic inflator bobbin on all automatic PFDs should be replaced on a regular basis. Use only Mustang Survival re-arm kits. Use of other re-arm kits may result in improper operation or failure to operate and will void the product's warranty. 
Re-arm kit contains: 

• One 24 gram CO2 cylinder (threaded) 

• One bobbin (used for automatic mode in A/M models only) 

• One re-arming instruction manual 

 For model numbers: MD2030, MD2030CM, MD2040, MD2040CM.