Boats with a gasoline engine or using propane fuelled devices must have ignition-protected electrical devices. These parts are designed and made in such a way that, under normal operating conditions, they will not ignite gasoline or propane fumes or vapours. This device prevents the sparks from coming into contact with the fumes while in use. Only use electrical components that are clearly labelled as ignition protected. Many older boats, and even some new ones, have been fitted with converted car or truck engines. If you are not sure that your engine is not equipped with ignition-protected parts, have it serviced by a certified marine technician. The mechanic can tell you if a replacement part (or related work done to the engine) has put you or others, at risk because it is not ignition-protected.