The McAlpine MACTUN-2 is a combined tundish and non-return valve that provides a reliable and efficient solution for protecting against backflow in a range of plumbing applications. Like the MACTUN-1, it is the only combined tundish and non-return valve with a silicone membrane seal, ensuring that it will not be affected by hard water areas. The MACTUN-2 is made from high-quality materials that are resistant to corrosion and can withstand high temperatures. It features a silicone membrane seal that ensures a tight and reliable seal, even in hard water areas. The tundish and non-return valve combination of the MACTUN-2 provides a reliable and efficient solution for protecting against backflow, which can cause damage to plumbing systems and create a risk of contamination. The non-return valve ensures that water flows in only one direction, while the tundish provides a visual indication of any excess water that may be present in the system. Overall, the McAlpine MACTUN-2 is a reliable and efficient solution for protecting against backflow in a range of plumbing applications. Its high-quality materials, silicone membrane seal, and combined tundish and non-return valve design make it a durable and long-lasting choice for both residential and commercial plumbing systems. The MACTUN-2 is similar to the MACTUN-1, but may have different inlet and outlet sizes or other specific features that differentiate it from the MACTUN-1. MACTUN incorporates a self closing membrane which opens to allow discharge to flow freely and then closes to form a seal. This prevents foul odour or sewer gas entering the building when installed into a waste or soil pipe. The membrane seal has no spring mechanism and shall not be affected in hard water areas. The membrane seal creates no resistance ensuring a smooth discharge flow from the PRV/TRV Temperature Rating 100°C The product is generally maintenance free. If required the top tundish window can be removed from the Mactun body for inspection or cleaning when maintenance work is being carried out.

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

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