If the point where the cooling water is injected into the exhaust is less than 15 cm above the waterline, then when the engine is stopped, there is a risk that cooling water will siphon into the exhaust system and subsequently into the engine it self. Such siphoning may be prevented by fitting a antisiphon at least 40 cm above the waterline.

If the point where the cooling water is injected into the exhaust is less than 15 cm above the waterline, then when the engine is stopped, there is a risk that cooling water will siphon into the exhaust system and subsequently into the engine it self. Such siphoning may be prevented by fitting an anti-siphon at least 40 cm above the waterline.