119001 Flashback Arrestor Set for Oxygen and Propane

Flashback arrestors help prevent reverse gas flow and flashback (flame burning back through the torch, hose, regulator and tank.) By utilizing an internal reverse flow check valve and a flame arrestor that quenches the flashback flame. 

Connects between regulators and hose. The flashback arrestor is for mounting on regulators. Standard "B" fitting. You will notice this arrestor is red. Red = Fuel.