Safety Main Stopper 42" INCH Type C Pipe Plug Stopper Bladder NEW 2018 $399 WE ARE LISTING OTHER SIZES..,. MADE IN 2018 ONE OF THESE COMES NEW IN THE FACTORY BOX. THE SECOND ONE DOES NOT. THE BOXED ONE SELLS FIRST. THE 2ND ONE SHOWS SOME FLOOR SMUDGES ON THE BACKSIDE. SEE PHOTO. 100% Polyester Covered Mains Bags FYI............... Type "C" Bags are for use wherever a plain rubber bag would not hold. This covered bag consists of an inner bag made of a high quality Natural Rubber bladder that is then encased in a 100% Polyester fabric cover. The gauge of rubber and polyester vary with the size of the bag. Each size bag is expertly made to insure a snug fit and good shut-off when inflated. Inflating valves are standard with each bag; pressure gauges are recommended and can be furnished at an extra cost. Covers can be made flame retardant and bladders can be supplied in hydrocarbon-resistant Nitrile Rubber at an extra cost. DO NOT use Natural Rubber Type "C" Bags in oil, gasoline, kerosene, acids or any similar substances. Contact us for specific recommendations when bags are to be used in lines containing these substances.