... , more light,more firmless.11.2L lubricated oil to keep best lubrication and compressor working well.12.Double oil sight glasses,easy ... $anticlockwise, keep friction surface well lubricated.15. Oil filter to prolong the compressor service life. Specification ModelCylinderDischargeVolumeLubeVolume/ModelRotationSpee(rpm)Dischargepipe sizeAir suctionpipe ...