17 FLEXIBLE RUBBER, PLASTIC, SYNTHETIC AND COMPOSITE TANK SEALS FOR STORAGE TANKS; FLEXIBLE STEEL REINFORCED RUBBER AND PLASTIC SYNTHETIC GASKETS, FLEXIBLE 0-RINGS AND OIL SEALS; FLEXIBLE RUBBER AND PLASTIC SHEETING FOR STOPPING AND INSULATING; SLEEVES FOR CONVEYING FLUID AND GASSES; RUBBER BELLOWS, BEARINGS, MEMBRANES, VALVE SEATINGS, VIBRATION ABSORBERS, AND BUFFERS FOR CONVEYING FLUID AND GASSES