LavaTap Fernox Water Hawk is a non-setting jointing compound for plumbing that helps create durable water seals on threaded pipe joints in domestic and commercial systems. This WRAS approved plumbers paste is suitable for both hot and cold potable water as well as 1st and 2nd family gases including Natural Gas and can be used as a leak sealer or pipe thread sealant across a wide range of fittings and materials. Its corrosion-resistant formula protects metal threads from rust and chemical attack, making it ideal for long-term installations. Whether you're sealing radiator valves, compression joints, or gas line connections, Water Hawk spreads easily to form a flexible, watertight barrier that resists shrinkage and cracking over time. Fernox Water Hawk can be used as an alternative to traditional putty or liquid PTFE, because unlike these methods, this compound stays soft, enabling future disassembly of joints without damage. Supplied in a durable 400 g tin, this compound stays fresh between uses and is suitable for professional or DIY applications.