A Sabroe threaded nipple (connection for unloading mechanism, SMC) is a short pipe fitting used in Sabroe refrigeration and HVAC systems. It has threaded ends for secure connections, typically used to link components such as the unloading mechanism in compressors. This nipple ensures a stable, leak-free connection, facilitating the smooth operation of the unloading mechanism and proper refrigerant or fluid flow within the system. The connection helps ensure the unloading mechanism functions efficiently to adjust compressor capacity based on system demand.