The Model 6K00 Pressure / Vacuum Vent with Flame Arrestor is designed for use on atmospheric and low-pressure storage tanks where pressure and vacuum relief is required. The design includes a deflagration flame arrestor consisting of a crimped SST metal element which allows the flow of gases or vapour of flammable liquids but prevents the flame-transmission from the outside. It provides an extinguishing barrier to the ignited vapour mixture by absorbing heat from the flame. The model 6K00 is used as an independent safety system to ensure explosion protection.