The McAlpine S28M-NRV Multifit In-Line Non-Return Valve is a plumbing component designed to prevent water or other liquids from flowing back into the system once they have been pumped out. This is important for maintaining the integrity of the system and preventing contamination. The valve is designed to be installed in-line with the plumbing system, and it features a top access point for easy cleaning and maintenance. This makes it ideal for use in applications where regular cleaning is required, such as in commercial kitchens or other areas where food or other materials may become trapped in the system. The valve is part of the McAlpine Multifit range, which means it is compatible with a wide range of plumbing systems and can be easily installed without the need for specialist tools or knowledge. It is made from high-quality materials to ensure durability and long-lasting performance. Overall, the McAlpine S28M-NRV Multifit In-Line Non-Return Valve is a reliable and effective solution for preventing backflow in plumbing systems, and its top access point makes it easy to clean and maintain. ・ Available in 1¼" and 1½" sizes ・ Prevents back flow of water ・ Must be installed in the horizontal position ・ Should only be used when there is no alternative ・ Universal Connections