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This La-co regular soldering flux paste is non-acid, non-toxic, and lead-free, perfect for copper soldering. It cleans pipes as you apply it, providing a smooth finish for the solder to easily flow, ensuring a suitable surface for connections. It is available in different sized tubs and features an all-weather formula that's ideal for both hot and cold climates. Its water-soluble nature makes it suitable for water piping, as it won't leave harmful residue. Additionally, it is non-corrosive. This product comes as La-co Regular Soldering Flux Paste - Medium 125g.. La-co Regular Soldering Flux Paste - Medium 125g JTMPlumbingLim1089