NBN ISO 13363:2021

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). It does not apply to outboard motor/personal water craft.
The three types are the following:
— 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 the following:
— class A: intended for diesel engines;
— class B: intended for petrol engines and for diesel engines with a very high exhaust temperature.