To  be  safety  and  durability, Meihua  click  style  oxygen  regulators manfactured  from  brass  and  aluminum. For  your  choices, we  have CGA870  hose  barb  outlet. 12posotion  flow  rate  ensure  the  flow adjustable  by  your  own  needs  easily  reading. The  xombination  of anodized  aluminum  and  brass  core  componets  makes  this  regulator extremly  lightweight  and  affordable  with  integrity.