The MS-LOE compressed air lubricator supplies the compressed air with a finely dosable quantity of oil for pneumatic components. The oil lubricators of the MS series can be installed as modules in service units according to the simple modular system. Four sizes offer a wide flow rate spectrum. The housings are made of die-cast aluminum, the filter bowls are also made of metal or polycarbonate with bowl guard. They are also configurable for use in potentially explosive areas of zones 1, 2, 21 and 22 as well as with UL approval.