the "vent" on a vented loop - SailNet Community
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post #1 of 8 Old 07-03-2012 Thread Starter
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Question the "vent" on a vented loop

Is there a name for the little valve thing that goes on top of a vented loop? I can find vented loops for sale, but not just the little piece that goes on top, and I wonder if I'm just not using the right search term. I'm in the middle of replacing my head (perhaps the most horrible thing I have ever experienced), and I would like to reuse my existing vented loop since it's in nearly perfect condition, but the little valve needs replacing.

1979 Gulfstar 37 Laissez Faire
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post #2 of 8 Old 07-03-2012
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Re: the "vent" on a vented loop

Try here Forespar MF-841 Replacement Duck Bill / Cap Assembly
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post #3 of 8 Old 07-03-2012
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Re: the "vent" on a vented loop

YAY! Those little duckbill valves are on my list of spares that I want to have on board, although you could probably get by with cleaning it and maybe softening it with lube or something.

Ray
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Boating for over 25 years, some of them successfully.
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post #4 of 8 Old 07-03-2012
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Re: the "vent" on a vented loop

Now that is excellent. I've always presumed that the things were only sold as complete units which is annoying when it is usually the valve that misbehaves and that is the easy bit to replace.

Thanks Ebs.

Andrew B (Malö 39 Classic)

“Life is a trick, and you get one chance to learn it.”
― Terry Pratchett.
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post #5 of 8 Old 07-05-2012 Thread Starter
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Re: the "vent" on a vented loop

I think this thing is more like what I need (similar product with a hose barb on top). Unfortunately, it has a 1/4" barb, and the existing vent system, some of which is being reused, is all 1/2". Now I've got some search terms to play with though. Thanks!

1979 Gulfstar 37 Laissez Faire
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post #6 of 8 Old 07-05-2012
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Re: the "vent" on a vented loop

For the intake line , some just burn a hole in the platic tubing, with a hot nail, at the high point of the loop, then put their finger over it while pumping. Its intake water ,so it's clean.
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post #7 of 8 Old 07-06-2012
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Re: the "vent" on a vented loop

Quote:
Originally Posted by rmeador View Post
Is there a name for the little valve thing that goes on top of a vented loop? I can find vented loops for sale, but not just the little piece that goes on top, and I wonder if I'm just not using the right search term. I'm in the middle of replacing my head (perhaps the most horrible thing I have ever experienced), and I would like to reuse my existing vented loop since it's in nearly perfect condition, but the little valve needs replacing.
Does it look like this?




If so they are made by the Scot Pump Co. and you can buy just the vacuum breaker. I think the part number is VB-18....

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Re: the "vent" on a vented loop

Maine Sail, yes it does look much like that white "siphon break" part on the top, but the loop is a continuous piece of stainless, not two elbows and a T. The Forespar valves ebs001 found are exactly what I need, but unfortunately won't fit the loop, so I bought a new Forespar vented loop complete with vent. I'm not going to bother to vent overboard with the new install, seeing as someone pointed out it only sucks air in, so no sewage smell should escape (the holding tank will still vent overboard, of course). Thanks for your help.

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