LA-CO plumbing products have been sold in the UK for over 45 years. The LA-CO brand is of high-quality, high-performance plumbing and HVAC chemicals and is a trusted partner for professional contractors around the world. When it comes to soldering, LA-CO is the brand that plumbers around the world trust to do the job right the first time, every time. LA-CO Regular Flux is a water soluble flux that meets industry standard and is WRAS approved. With NSF and UPC approvals, this all-weather flux is the ultimate flux for all copper soldering.