The thermal, non-resettable flash back arrestor is an advanced protective device that prevents dangerous flashback to the gas source. With this protection, the risk of explosion in acetylene systems is minimized. The arrestor works on the principle of detecting temperature rise, automatically blocking the flow of gas in case of danger. Its non-resettable design ensures high reliability and eliminates the risk of failure, providing a key element in ensuring safety in flammable gas workplaces.