Type H has a hose connection to the outside of the hull. There is a constant bleed off of cooling water through this hose whilst the engine is running. Type H comes complete with a skin fitting, hose clamps and 4 metres of hose._x000D_
Can be connected to hoses with internal diameters of Ã¸ 13, 19, 25 and 32 mm (½., ¾., 1. & 1¼. ). _x000D_
Why fit an anti-syphon device?_x000D_
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 exhaust system and subsequently into the engine itself. Such siphoning may be prevented by fitting a VETUS air vent at least 40 cm above the waterline._x000D_
Housing : Made of synthetic material_x000D_
Mounting brackets are available for both types of air vent, to facilitate installation onto surfaces clad with sound insulation.