The Nipple (OEM Part No. 3128315037) is a spare part compatible with M2D, Boomer XE3C, Boomer L2D and BOOMER-M2C underground drilling rigs. Manufactured from durable alloy steel, it acts as a hydraulic component for the hydraulic lubrication & oil circuit at the grease fitting connection position. This grease nipple connects centralized lubrication pipelines, transporting lubricant to rotating and sliding joints to reduce metal friction and prevent component seizure underground. Its compact alloy steel structure ensures tight sealing, smooth oil supply and stable operation of rig hydraulic lubrication systems.