Flashback Arrestor For Regulator, MNPT outlet connections make it easy to adapt in various applications. It uses a sintered metal element to quench the flame and a check valve to prevent reverse gas flow. Shop Online. FNPT inlet and 1/4 in. FBR-1 Flashback Arrestor Oxy/Fuel regulator-mount Pair Pack. Flashback arrestors and reverse flow check valves Browse flashback arrestors with internal check valves for complete protection. Stainless steel high-flow regulator flashback arrestors are designed for oxygen, hydrogen and other flammable or fuel gases. 300 Series industrial grade, golden finish for enhanced safety and durability. 0656-0004 Flamebuster FBR-1 Heavy Duty Flashback Arrestor - Pair Pack, Oxy/Fuel, Regulator Mount, B Oxy/Fuel regulator-mount Pair Pack. Standard with 1/4 in. v1xm, nwna, 5efi, ounv, kmujo, okvuh, lj9, fjc, a4oglmzy, lgx,