The McAlpine BSW21P Centre Pin Sink Waste is a plumbing component that is used to connect a sink to the drainage system. The waste has a stainless steel flange with a diameter of 85mm, which is designed to fit into the sink's waste hole. The waste also comes with a plug that can be used to stop the flow of water through the sink. The "Centre Pin" in the name refers to the design of the waste. Instead of using a traditional screw-in waste, which can be difficult to install and prone to leaks, the Centre Pin waste uses a unique locking mechanism. This makes it easier to install and provides a more secure fit, reducing the risk of leaks. Overall, the McAlpine BSW21P Centre Pin Sink Waste is a high-quality plumbing component that is designed to provide a long-lasting and reliable connection between your sink and the drainage system. ・ Available in 1¼", 1½" and 2" sizes ・ Black PVC plug ・ Available with or without chain and stay ・ Centre pin dry fixing connection has the advantage of a quick, simple and neat installation affording a saving in material and labour costs ・ The polished stainless steel flange eliminates the problem of chrome plating deterioration