Should you want to have a backup bottle on hand, grab this replacement pepper spray canister. Replacing the canister is easy: The pepper spray insert can be twisted, pulled out and replaced. When replacing with the new insert you need to push the canister back in until you hear it pop and the canister is seated all the way to the bottom of the sleeve. Make sure that the red actuator on the new canister is in the safe lock position when replacing the insert.