Specification Brand : TywelMaster BulletPoint1 : Purpose: Prevents a flame from traveling past the flashback arrestor in the event of a flashback. Never connect a torch to acetylene and oxygen tanks(cylinders) without installing a set of flashback arrestors at the Torch/Hose/Regulator. Without these safety devices, it is possible a flash can occur within the hose, and ultimately follow back into the tanks, causing an explosion. BulletPoint2 : Built-in check valve prevents the reverse flow of gas. High quality brass construction, case is rugged and corrosion resistant. BulletPoint3 : Color coded for safety. (Oxygen are defined in Blue/Green in different country, our label normally is green.) The Acetylene Arrestor in this set can also be used for Propane and Mapp gas. Oxygen is standard RH (right hand) threads, Acetylene is standard LH (left hand) threads. Oxygen P max=1.5bar/21psi; Acetylene (Fuel) P max=20bar/290psi. Fits most the welding/cutting twin hose sets. BulletPoint4 : Fitting: 3 Styles for different markets: M16*1.5mm, Popular in China, RU, FR, DE, etc. 9/16"-18 (14.29in) (CGA022/CGA023), Popular in USA, etc. BSP3/8” (BSP9.525in), Popular in UK, etc. 2 Mount methods: Torch Mount. Used on Torch end. Regulator Mount. Used on Regulator end. BulletPoint5 : Package:1pair (choose style and mount): 1pc Acetylene/Propane Flashback Arrestor 1pc Oxygen Flashback Arrestor ItemName : Flashback Arrestor 1 Pair, Check Valve Flame Buster 9/16" 3/8" M16 for Acetylene Propane Gas Blowtorch Welding Gun Cutting Torch (Regulator Mount 9/16"-18) ItemTypeKeyword : welding-gas-regulators Manufacturer : TywelMaster Material : Brass PartNumber : Flashback Arrestor ProductDescription : cutting torch protection. ProductSiteLaunchDate : 2020-08-05T09:05:43.870Z Style : Regulator Mount 9/16"-18