Great Sealing Performance: Sewer Test Plug is made from quality rubber, this sewer test plug offers great airtightness and strong elastic, ensuring reliable water blockage during repairs and tests Quality & Resistant: Features outstanding wear resistance, and anti aging properties for long time to use in demanding environments Versatile Application: Ideal for emergency pipe repairs, sewage pipeline maintenance, and water leakage detection; quickly blocks water flow in hoses of various diameters and positions Efficient Operations: Expands rapidly when inflated to fill the entire pipe section; frictions between the plug and pipe wall ensures a secure seal with clear pressure monitors via the included matte air pressure ball Complete Set & Convenient Size: Includes 1 inflatable plug and 1 air pressure ball, make it easy to handle for underground drainage or cleaning projects Specification: Material: Rubber Size Chart:23cmx19cm/9.06inchx7.48inch Package Includes: 1 Sewer Test Plug 1 Air Pressure Ball Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.