The Monument 1368U 2 Piece Test Plug Set is a professional plumbing tool designed for blocking off small bore copper pipes during dry testing prior to system commissioning. Ideal for plumbers and heating engineers, this essential test plug set ensures pipework integrity before final connections are made. This convenient two-piece set provides coverage for the most common domestic pipe sizes, making it a practical addition to any plumber's toolkit. The plugs are specifically engineered for dry testing applications on copper pipe installations, allowing you to verify system integrity efficiently before commissioning. It's important to note that these test plugs are designed for dry testing only and cannot be used for air testing purposes by themselves. This makes them particularly suitable for checking water-tight seals on new installations, extensions, and refurbishment projects where copper pipework requires verification before going live. Contents:1 x 1370B 15mm Test Plug1 x 137