If the point where the cooling water is injected into the exhaust is less than 15cms above the waterline, then when the engine is stopped, there is a risk that cooling water will siphon into the engine.
This can be prevented by fitting a Vetus air vent at least 40cm above th waterline. Anti-syphon device ASD38V has a valve and is suitable for hose 38mm.
This air vent is made of synthetic material and is exchangeable with type AIRVENT due to the same fixing holes centres. It has a silicone anti-siphon pressure valve and is self-contained.
Type ASD38V has a hose connection with an internal diameter of Ø 38 mm and is ideal for toilets or holding tanks which are installed below the waterline.