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Old 04-23-2008
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Unhappy Anti Siphon Valves

We have not been completely happy with the siphon break valve for wet marine exhasut systems which we have sourced to date. The only one we see is from Vetus. Are there other suppliers or manufacturers of this device?
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Old 04-24-2008
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They are pure evil.

I suggest if it is possible that you run a hose from the top of the siphon (where the stupid and failure-prone check valve/vent thingie screws on) up above the waterline to a gooseneck in the cockpit or on the cabin side or top...any place where the chances of being submerged are lowest. Basically, the sole point of this is to provide an atmospheric pressure outlet to allow the water in the exhaust system to drain back into the waterlock or waterlift device instead of to the exhaust manifold...any hose will accomplish this, as the principle is very similar to that of a fuel or water tank vent line: to equalize pressure. Add a bit of bug screening material to the end of the hose gooseneck to prevent spider annexation.
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