Sturdy Metal Material: Made of pure brass material, and reusable, not easy to age. Simple to UseInstall the water stop needle on the matching wrench, insert it into the PPR water pipe obliquely, rotate and tighten until the water flow stops, weld the pipe with a hot melt machine, and take out the water stop needle after the welding is completed. Tube Water Stop Needle: Three sizes of 1/2/, 3/4/, and 1 inch.lightweight and easy to carry, and can be used for overhaul and repair works and drinking water work. Always Available: Put into the water pipe, which is used to twist the needle, so that the rubber loop expands to achieve the purpose of water stop. Application: It is widely used for indoor and outdoor concrete slab cracks, through wall pipes, wall corners, tunnels, and other water leaks, with a water stop function. Specification: Material: Pure Brass Color: Black Size: 1/2 inch, 3/4 inch, 1 inch Package Includes: 3 Hot Melt Water Stopper 6 Rubber Caps Note: Please allow slightly errors due to manual measurement and different monitors.