Tec7 Plumb from Contech Buildings stops and prevents leaks in all open and closed heating systems. Tec7 Plumb’s unique formally ensures that it works instantly and unlike similar products in the market, says the company, it is guaranteed not to clog. Ideal for use in both domestic and industrial applications, one 750ml can is sufficient to treat systems with 75lts of water or 8 to 10 standard single radiators.