Balcrank Mini Air Lubricator fits 1/4" NPT(F) and includes a transparent sight dome for 360 visibility. Air lubricators are used to maintain airborne oil mist for pumps to prolong their operating life and reduce wear, featuring proportional oil delivery with a precision needle valve. Mini Series lubricators are compact for low-volume air applications and also include a high-strength, polycarbonate bowl and a heavy-duty, die-cast zinc body with a max pressure rating of 150 PSI.