The McAlpine Waste Valve 1.1/4" Tundish Macvalve-3 is a plumbing component used in waste and drainage systems. The valve is designed to allow waste water to flow out of a plumbing system while preventing gases and odors from entering the living space. The valve includes a tundish, which is a small device that allows air to enter the system and prevents the waste water from siphoning back into the plumbing fixtures. The Macvalve-3 model is specifically designed for use with a 1.1/4" waste pipe. It is made by McAlpine, a leading manufacturer of plumbing products in the UK. Installation of the McAlpine Waste Valve 1.1/4" Tundish Macvalve-3 should be done by a qualified plumber, following local codes and regulations. It is important to ensure that the valve is installed correctly to prevent leaks and other issues in the waste and drainage system. 1.25" outlet BSP female inlet nut x universal compression outlet Supplied with Tun Dish Adaptor - 1.25" BSP male thread x 22mm Universal inlet Can be used to take the discharge from a pressure relief valve on an unvented domestic hot water storage system. Please refer to guidance notes in approved Document G3 of the Building Regulations Membrane opens under water pressure to allow discharge to flow freely and then closes to form a seal to prevent foul odour or sewer gas entering the building

It is designed and manufactured by McAlpine, a UK-based company that specializes in plumbing products.

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