This 1/4 in NPT Precision Lubricator with polycarbonate bowl is the drip-style, which allows precise settings for trouble-free protection. The adjusting knob can be removed in order to prevent tampering and the sight glass dome allows observation for instant drip rate adjustment. The 5 oz polycarbonate bowl with metal bowl guard may be filled without shutting down line pressure, delivering oil at an air flow as low as 2 scfm. Lubricator is designed to provide oil to air tools that require lubrication for operation. Maximum pressure of 150 psi and 16 scfm.