The air preparation equipment includes a Filter Regulator Lubricator joined together by a mounting bracket. This cleans the air of water, oil and other suspended debris regulates the downstream pressure and injects mico mist lubricant into the cleaned air to give air tools and machines longer life. Easy to install and service, all units come with a mounting bracket, gauge, auto drain and polycarbonate bowl guard with sight glass. For more info: https://empirelubeequipment.com/collections/filter-regulators-lubricators