General purpose air line lubricator. Constructed of die-cast zinc. Metal bowl with sight glass. Maximum supply pressure 250 PSI (17 bar). Maximum temperature 150 degree F (65 degree C). Oil viscosity maximum not over 800 S.S.U. (SAE 30, not under 85 degree F/29 degree C). Note: Oil adjustments may be made tamper-proof by removing Dial Set knob. May be filled while under pressure.