is the flashback arrestor part of the regulator handle on a welding/torch kit
ocxygen actetylene torch welding kit with regulator/check valve and the question is do the torch regulator have the flash back arrestor built into the body of the regulator itself or is it a seperate part
Older units the arrestor is seperate, if the have one at all.
Newer units they are built in.
You need to examine the torch to determin what you have.