The McAlpine R16-GR is a plumbing component that is designed for use in waste water systems. Specifically, it is a 1.25" plain tail that features a 19/23mm universal connection. The plain tail refers to the straight section of pipe that connects to the waste outlet, while the universal connection allows for a variety of waste pipes to be connected to the component. The R16-GR is similar to the R16-BL described earlier, but the difference is that the R16-GR comes with a green cap. This green cap serves as a visual indication that the component is suitable for use in grey water systems. Grey water is waste water that is generated from sources such as washing machines, sinks, and showers, and can be reused for certain purposes such as flushing toilets and watering plants. The McAlpine R16-GR 1.25" Plain Tail x 19/23mm Universal Connection is a reliable and versatile plumbing component that is suitable for a range of waste water systems, especially those that involve the reuse of grey water. Available in Black or Grey 1.25" Plain Tail x 19/23mm Universal Connection Reduces Mechanical Pipe Boss Connector to accept 19/23mm pipe Conforms to BS 6798:2014 and Building Regulations Approved Document H | McAlpine R16-GR 1.25" x 19/23mm Reducer in ABS Grey