Wilkerson miniature lubricator with transparent bowl. Do not fill under pressure. Air supply must be turned off and pressure bled from unit prior to adding oil. Wilkerson miniature lubricator with transparent bowl. 1oz Bowl capacity. Adjustable oil feed. Full view sight dome. Maximum operating condition: 150 PSIG (10.3 bar) and 32 degree F to 125 degree F (0 degree C to 52 degree C).