LPG will damage an incompatible hose, including most acetylene hoses. It can be used for emergency repair of leaking low-pressure hoses and pipes. Its oiling gear, hoses and fittings were too often poorly designed. Many fire engines have such relief valves to prevent the overpressurization of fire hoses. Silicone rubber compounds are used for hookah hoses instead of leather and wire. Norway uses NOR fittings for attack hoses. Nipples are commonly used with plumbing and hoses. Many products are made with vulcanized rubber, including tires, shoe soles, hoses, and conveyor belts. Damaged fuel hoses need to be replaced. The car had numerous quick-connect hoses and easily removable bolts. Manufacturers are starting to use a synthetic rubber substitute called Viton for seals and hoses. These engines are connected to the rig by high pressure air hoses. The gimble had 100 horsepower and was powered by hydraulics and hoses. About 20% of world production goes into belts, hoses, and other non-tire rubber goods. Hoses up to in diameter with pressure ratings up to are now available.