The Weldmark by Superior FBK200 flashback arrestor is designed to stop flashbacks by preventing ignition of mixed gases, protecting welding hoses, regulators and cylinders. It is a torch style flash arrestor made from brass, with a stainless steel flame trap. It is compatible with oxygen and fuel gas, is color coded (green for Oxygen and red for fuel gas), has a flow rate minimum of 2psi, and includes a check valve. It has a male inlet, and female outlet connections, both at connection size 0.5625 at 18 threads per inch. No manual resetting required. UL Listed. Made in the United States.