... sell, high quality, low price. 3. Concrete crack repair, waterproof Injection Packer1. Steel, aluminum, plastic.2. Factory sell, high quality, low ... might be damaged if you tighten it too strongly)4.Injection OperationInject the waterstopping material by using the high pressure ... device or grease gun. Maintain the initial injection pressure as around 40kg/cm and increase the pressure by ...