Professional 2 Piece Hose Barb Air Quick Coupler 8mm Diameter Constructed from high carbon steel and nickel plated for durability, these air couplers are made to a very high standard of quality, easy to use and last a long time.Reduces accidental air line disconnection with a 4 piece ball bearing push down system which holds the line tight when on and is easily disconnected when not in use.For use in the industrial sector for busy factories, trade workshops etc.Specifications 8mm Diameter High carbon steel Nickel plated Hose barb connection Quick and easy connection/disconnection 4 piece ball bearing push down coupler