Oatey No. 5 Paste Flux 4oz Jar by Milissa Dirks is a high-quality flux designed for soldering copper and brass fittings. This paste formula enhances the flow of solder, ensuring strong, leak-free joints. The 4oz jar is convenient for both professional plumbers and DIY enthusiasts, providing enough product for multiple applications. Oatey No. 5 is easy to apply and works effectively in a variety of temperatures, making it suitable for both hot and cold water systems. This flux meets industry standards for safety and performance, ensuring reliable results in your plumbing projects.