Application: Man Hours 1 This applies to all control air filters installed in control air systems that are not part of the basic air compressor or air drier configurations. Items to Check & Initial Completion: 1.___ Valve filter out of service. 2.___ Remove and discard old cartridge. 3.___ Clean inside of housing. 4.___ Install new cartridge. 5.___ Open inlet valve and check for leaks. 6.___ Open outlet valve. Tools and Materials: 1. Standard Tool kit. 2. Cartridge