This 1/4" NPT lubricator 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 6-ounce metal bowl may be filled without shutting down line pressure, delivering oil at an air flow as low as 2 SCFM. The lubricator is designed to provide oil to air tools that require oil for operation. Maximum pressure of 200 PSI and 16 SCFM.