The McAlpine BSW9P Centre Pin Bath Waste is a type of waste system used for bathtubs. Here's what each component of the product means: Centre Pin Bath Waste: This is the main part of the waste system, which is used to drain water out of the bathtub. It is designed to fit into the standard 1.5-inch (38mm) waste hole in the bathtub. 70mm Stainless Steel Flange: This is the part of the waste system that is visible on the surface of the bathtub. It is a circular plate with a diameter of 70mm, and it is made of stainless steel. This component adds an aesthetic appeal to the bathtub and also provides a durable and corrosion-resistant finish. Black PVC Plug: This is a removable cap that fits into the Centre Pin Bath Waste. It is made of black PVC and serves as a temporary stopper to prevent water from draining out of the bathtub. It can be removed easily when the user wants to drain the water. Overall, the McAlpine BSW9P Centre Pin Bath Waste is a reliable and durable solution for draining water out of bathtubs, and the stainless steel flange and black PVC plug make it an attractive addition to any bathroom. ・ 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