3-inch (about 7.6 cm) sewer water pipe plug: Includes 1 piece of pre-assembled sewer cleaning cover; designed for everyday use; threaded pipe water stopper helps prevent pipe damage and protects sinks and pipes. Stable performance: Made of high-quality rubber and metal with maximum expandability for a tight seal; stainless steel wing nut offers greater reliability, stability, and strength compared to plastic wing nuts; built for long-term use. Easy to use: Threaded rubber plug provides effective protection against water entry into pipes; simply screw the plug into return and drain inlets after pipe cleaning—no wrench required; intuitive size and operation. Wide usage: Suitable for sealing pipes during winter to prevent freezing; also used for pressure testing in swimming pool maintenance and preventing water outflow. Practical application: Can be used as a mechanical test plug for storage devices; compatible with various pipe types; suitable for outdoor swimming pools, kitchen sinks, bathroom sinks, and small indoor pools. Includes: 1 x Sewer Water Pipe Plug