Fernox Powerflow Paste 350g is a premium, WRAS-approved soldering flux designed for copper plumbing systems. This soft, white paste is easy to apply and effective for both lead-containing and lead-free solder alloys. Ideal for use with end feed and integral ring solder fittings, it ensures a clean, efficient joint and is suitable for potable water applications. With self-cleaning properties, it’s perfect for both hot and cold water systems.