StarSide 1 Pc Mist Coolant Lubrication System Can Joint for 8mm Air Pipe for Cnc Lathe Milling Machine Fit for 8mm air pipe Engraving machine spray cooling,Special design,direction of rotation,easy to operate. Standard fixing device,fine spray port, long life. Cooling stone/metal/ceramic tile engraving machine. For CNC Lathe Milling Drill Machine.