What should be done if a gas hose shows evidence of flashback?

When a gas hose shows evidence of flashback, the correct action is to replace the hose immediately. Flashback within a gas hose indicates that flames or heat have traveled back toward the source of flammable gas, which poses a significant safety risk. This situation suggests that the integrity of the hose has been compromised, possibly leading to leaks or further flashback incidents.

Replacing the hose ensures that the equipment is functioning safely and effectively, eliminating any potential hazards associated with a damaged or unstable hose. Continuing to use a hose that displays such evidence, or attempting repairs or temporary fixes with materials like duct tape, does not address the underlying issue and could result in catastrophic failures or accidents during use. Therefore, immediate replacement is essential to maintain safety standards in soldering and brazing practices.