The McAlpine Z28M-NRVS is an in-line non-return valve designed for plumbing and drainage systems to prevent backflow. It features 2" solvent weld connections for a secure and leak-proof fit and a top access design for easy cleaning and maintenance. Made from high-quality materials for durability, it's suitable for domestic and commercial use, including sewage treatment and industrial processes. The valve must be installed horizontally and used only when no alternative is available. Complies with BS EN 1329-1:2020 standards.