Vetus air vents prevent sea water from siphoning back through the exhaust into marine engines. Also called a vented loop, it is used as a siphon break for marine toilets and holding tanks. This siphon break is critical for engines utilizing a wet exhaust system. Vent mounts in the coolant line before the mixing elbow with the exhaust gas. Ideal installation is 16 inches above the water line.
Two types are available. AIRVENTH comes with 12 feet of hose to connect the vent to the outside of the hull. When the engine is running a constant bleed of cooling water trickles out. Along with the 12 feet of hose comes a skin fitting and hose clamps.
AIRVENTV model has a pressure valve and is self contained. It does require periodic maintenance to prevent clogging with salt crystals.
Repair kits also available. See "Product Info" tab for specifics.
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The Vetus airventh with the 12 ft hose does it need to be a downhill run from the vent itself all the way to the drain in the hull or can it have a dip to the bilge then up to the drain in the hull as I was thinking of "T"ing it to the drain in the sink head?CheersStuart
I don't know. We are using the air vent without the hose. So far it works very well. Not sure why the exhaust hose would be desirable.Ron
I needed to add a vent to prevent water siphoning into my exhaust line. I only happened occasionally, but this should prevent future occurences.
Mt Sinai, NY
I have rebuilt "conventional" anti siphon valves to direct the small amount of salt water that they blow during operation. Since these anti-siphon valves must be mounted high, this "spitting" eventually corrodes something below them.I've never understood why valve makers haven't made this design a standard.I'm told this valve also seems not to require as much servcing as most. Time will tell. . .