The McAlpine R29-NRV 90° Elbow with integral Non-Return Valve is a plumbing component that is used to connect a plain tail inlet to a 19/23mm universal outlet in a plumbing system. Here are some of its features: Size: The elbow has a plain tail inlet and a 19/23mm universal outlet. Material: The elbow is made of high-quality polypropylene material that is durable and resistant to corrosion. Integral non-return valve: The elbow is designed with an integral non-return valve that allows for water or other fluids to flow in one direction only, preventing backflow and contamination of the plumbing system. 90° elbow design: The 90° elbow design of the connector allows for a smooth and efficient flow of water from the plain tail inlet to the universal outlet. Easy to install: The elbow is easy to install and can be used in both residential and commercial plumbing systems. Complies with building regulations: The McAlpine R29-NRV 90° Elbow with integral Non-Return Valve complies with UK building regulations and is suitable for use in new builds, renovations, and repairs. Overall, the McAlpine R29-NRV 90° Elbow with integral Non-Return Valve is a reliable and efficient plumbing component that is designed to connect a plain tail inlet to a 19/23mm universal outlet in a plumbing system. It is made of high-quality polypropylene material and is easy to install, making it a popular choice for plumbers and DIY enthusiasts alike.