brand and high quality Features: Prevents a flame from traveling past the flashback arrestor in the event of a flashback. Acetylene liquefied gas propane flashback arrestor can be used for acetylene gas, coal gas, liquefied gas and propane. Oxygen fuel flashback arrestor can be used only for oxygen. It is for 10mm pipe or 8mm pipe version for option. It is the basic style popular, which is little different with the professional exporting version. 2pcs Pipe Flashback Arrestors only, other accessories demo in the picture is not included! Specification: Types: Acetylene liquefied gas propane flashback arrestor, Oxygen fuel flashback arrestor Fitment for: 8mm pipe, 10mm pipe Material: Copper Dimensions: Length:78mm/3.07inch Color: Red, Blue Quantity: 2 Pcs Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 2 x Pipe Flashback Arrestors