Acetylene (or propane) Flashback Arrestor for the regulator end, and a check valve for the torch end.  Highest quality. 9/16 -18 threads, B Size.  

For the oxygen and acetylene sets, please click here.

NOTE: The acetylene arrestor and check valve in this set can also be used for Propane or Mapp gas, etc.  

Never connect a torch to acetylene and oxygen tanks without installing a set of flashback arrestors in the hoses at the regulators. Without these safety devices, it is possible a flash can occur within the hose, and ultimately follow back into the tanks, causing an explosion. This would be an extremely rare occurrence, but flashback arrestors will make it a "never" occurrence. Check valves are only a first line of defense and may not ultimately stop a flashback. Only the flashback arrestors will.

ISO 9001 certified factory. If you don't see this certification, for your safety, it's best to not buy the arrestors. 

Thanks very much.