A waste coupling is a plumbing component that is used to connect the sink or basin drain to the waste pipe. "Brass" refers to the material that the coupling is made of, which is a popular choice for waste couplings due to its durability and resistance to corrosion. A brass waste coupling typically consists of a threaded connector that is screwed onto the sink or basin drain and a slip-joint connector that is attached to the waste pipe. The slip-joint connector allows for easy installation and adjustment of the coupling's length.
Brass waste couplings are often preferred over other materials because they are durable, long-lasting, and resistant to corrosion. Additionally, they can withstand high temperatures and pressures, making them suitable for use in a variety of applications. When installing a waste coupling, it's important to ensure that the connectors are properly aligned and tightened to prevent leaks. It's also important to choose a coupling that is the correct size and thread type for the sink or basin drain and the waste pipe.