Pipestoppers Inflatable Stoppers and test plugs are available in a variety of formats in all sizes from 2" - 80" (50mm - 2000mm) in 1" (25mm) graduations. Types include spherical, cylindrical, rectangular, pancake and sausage.All bags are made of a natural rubber bladder and covered in waterproof sewn polyurethane coated nylon for low fric- tion and to prevent the production of static electricity and accidental sparking. >