Before revision: 300px| A flame arrester during testing 300px|A flame arrester made for a 91 cm (36 inch) pipe weighing 10 tons A flame arrester (also spelled arrestor), deflagration arrester, or flame trap is a device or form of construction that will allow free passage of a gas or gaseous mixture but will interrupt or prevent the passage of flame.
After revision: 300px| A flame arrester during testing upA flame arrester made for a 91 cm (36 inch) pipe weighing 10 tons A flame arrester (also spelled arrestor), deflagration arrester, or flame trap is a device or form of construction that will allow free passage of a gas or gaseous mixture but will interrupt or prevent the passage of flame.