A Sabroe welding nipple is a pipe fitting used in Sabroe refrigeration and HVAC systems that is designed to be welded directly onto pipes or components. Unlike threaded nipples, welding nipples do not require threading and instead offer a strong, permanent connection when welded. They are commonly used in situations where a secure, leak-proof connection is essential, such as in high-pressure systems, ensuring durability and integrity in the flow of refrigerants or fluids.