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This International Standard specifies requirements for three types and two classes of hose. The hoses are intended for use in marine-engine wet-exhaust systems (where the exhaust gases are mixed with the discharge of cooling water). The three types are: - type 1: a softwall hose, made of oil-resistant material, with a synthetic-fabric reinforcement; - type 2: a hardwall hose, made of oil-resistant material, with a synthetic-fabric reinforcement with a helical wire embedded in it; - type 3: a hose or tube (flexible connector), made of oil-resistant material, with or without a reinforcement or cover, intended for use in short lengths in locations where the connector is protected from mechanical damage. The two classes are: - class A intended for diesel engines; - class B intended for petrol engines, and for diesel engines with a very high exhaust temperature.