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  #11  
Old 12-03-2012
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Re: "Thingamajig" what the heck

Anti siphon. I had one on my boat and replaced it with a bronze type. The vent tube connected to it went into the exhaust hose about 4ft from the transom. Because it had a bad check valve (it's like disc) water was running out of mine when the engine was pumping water. It may be a different set up on yours.

click here for Vetus USA catalog. you will see a whole bunch of them! --> USA They do go bad.




http://www.jamestowndistributors.com...ice+with+Valve
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Last edited by deniseO30; 12-03-2012 at 04:54 PM.
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  #12  
Old 12-03-2012
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Re: "Thingamajig" what the heck

Quote:
Originally Posted by deniseO30 View Post
Anti siphon, I call it vacuum break, I had on on my boat and replaced it with a bronze type. For the engine raw water to vacuum break USA They do go bad. it's like a wafer or disk that keeps the water from going out the vent.. but lets air in when the water is not under pressure.

You have the one I had.

So do you have a link to the bronze one that you now have? Great info thanks!
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  #13  
Old 12-03-2012
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Re: "Thingamajig" what the heck

Quote:
Originally Posted by kellysails View Post
I am half tempted to put in a new short hose that goes directly from the heat exchanger to the mixing elbow. Looks to me as another single point of failure. Thoughts?
You have already been enlightened by other posts on the function of that little thingamajig but I just want to add a little about the Extreme Importance of it. On my Yanmar that loop is vented to the outside and 'mud dauber' wasps built a nest in it - stopping it's function. The next time I used the boat it ran fine and I shut down as normal. What I didn't know was that as the engine cooled down sea water was sucked/siphoned into the engine totally 'hydro-locking' it. I was lucky and no water go into my oil and it was a simple pull the injectors and spray in all over my interior while turning it over. That was 3 years ago - no problem. That would probably happen every time if you did as you were tempted to do above
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  #14  
Old 12-03-2012
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Re: "Thingamajig" what the heck



I researched it and it's been working fine for about 4 yrs now. they are also used on head lines Vetus didn't seem to any more durable for what it does. But even the bronze ones only have a little wafer for the check valve.
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  #15  
Old 12-03-2012
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Re: "Thingamajig" what the heck

Quote:
Originally Posted by deniseO30 View Post

I researched it and it's been working fine for about 4 yrs now. they are also used on head lines Vetus didn't seem to any more durable for what it does. But even the bronze ones only have a little wafer for the check valve.
Nice, adding to my future upgrade list. Can you hook in a small vent hose like the Vetus at the top of the cap? Or does it just vent right off the hole in the cap?

It looks like it is very easy to clean the wafer, nice setup.
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  #16  
Old 12-03-2012
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Re: "Thingamajig" what the heck

Yes it has a female pipe thread on top. the wafers are really flimsy in both. Mine was over 20yrs old don't forget.
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  #17  
Old 12-03-2012
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Re: "Thingamajig" what the heck

Quote:
Originally Posted by kellysails View Post
Nice, adding to my future upgrade list
You'll find the Groco fitting under toilet section at GROCO MARINE PRODUCTS. Bronze, ss, aluminum, plastic - the weak link is that disc (and the dawbers) so an inexpensive spare disc aboard and scheduled maintanance check will be a good addition. Depending on the material you might be able to make one in a pinch also.

Last edited by Faster; 12-03-2012 at 06:36 PM. Reason: fixed quote
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