This 1/2 in NPT Lubricator with metal 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 9 oz metal bowl 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 oil for operation. Maximum pressure of 200 psi and 142 scfm.