The McAlpine BSW10P Centre Pin Bath Waste is a plumbing accessory designed for use in bathtubs. Here's a breakdown of its key features: Centre Pin: The centre pin refers to the mechanism that controls the flow of water through the waste. In this case, it's a "pop-up" style waste, meaning that when you push down on the centre pin, the waste will open and allow water to drain out of the bathtub. When you push down on the pin again, it will pop back up and close the waste. Bath Waste: A bath waste is a plumbing component that connects the drain in the bathtub to the plumbing system of the building. It's designed to allow water to drain out of the bathtub, while also preventing any debris or other items from clogging the pipes. 70mm Stainless Steel Flange: The flange is the part of the waste that sits on top of the bathtub and secures the waste in place. In this case, the flange is made of stainless steel, which is a durable and corrosion-resistant material. Black PVC Plug: The plug is the part of the waste that seals the drain when the waste is closed. In this case, the plug is made of black PVC, which is a type of plastic that's known for its strength and durability. Overall, the McAlpine BSW10P Centre Pin Bath Waste is a high-quality plumbing accessory that's designed to provide reliable performance and long-lasting durability. ・ Available in 1¼" or 1½¿ ・ Black PVC plug ・ Available with or without CP chain ・ 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