anti siphon valve universal m25 - Page 2 - SailNet Community
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post #11 of 19 Old 08-23-2013
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Re: anti siphon valve universal m25

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Originally Posted by Stu Jackson View Post
Jim, you're right in that it is an AIR check valve. Most people reading your post, me included, most likely thought you meant a check valve in the WATER line, which we agree does not and should not exist.
Sounds like we agree Stu. Just a question of terminology.
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Re: anti siphon valve universal m25

I've removed everything and rest enn assuring me that the air or water circulating well. I'm a little skeptical that a cleaning pipes and valve gives a good result. I will test this weekend. Thank you again!
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post #13 of 19 Old 08-23-2013
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Re: anti siphon valve universal m25

Look at this:



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post #14 of 19 Old 08-23-2013
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Re: anti siphon valve universal m25

I had a nylon vented loop on my O'day 35 with an M25. I broke it, and have since installed a Forespar Marelon loop, but removed the duckbill, and retro-fitted the 3' long tube that goes well above the water line, and was originally on the nylon loop. I keep the duckbill - just in case.


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post #15 of 19 Old 08-23-2013
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Re: anti siphon valve universal m25

all this reminds me of something that needs to be done on my new inverted loop for the engine... connect the vent side to a hose! if it goes bad It will be a bad day for sure LOL

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post #16 of 19 Old 08-23-2013
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Re: anti siphon valve universal m25

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all this reminds me of something that needs to be done on my new inverted loop for the engine... connect the vent side to a hose! if it goes bad It will be a bad day for sure LOL
Think of it as a power rinse for the engine compartment...


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post #17 of 19 Old 08-26-2013
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Re: anti siphon valve universal m25

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Originally Posted by deniseO30 View Post
all this reminds me of something that needs to be done on my new inverted loop for the engine... connect the vent side to a hose! if it goes bad It will be a bad day for sure LOL

Thanks for the reminder, I will add it to my punchlist.

I learned the hard way this weekend after I finally splashed Shakti about why I was should not have forgotten to drill the shaft and set the set screw for the new motor coupling.

That and a couple hours stuck in the mud on my maiden voyage to the slip was an adventure.

Experience teaches us things we would rather not know.

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S/V Shakti '81 Offshore Cat Ketch 33'
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post #18 of 19 Old 08-27-2013 Thread Starter
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Re: anti siphon valve universal m25

I was skeptical but now I am confused! I cleaned the gasket and all rested up and I have no leak. Everything works as before. Thank you for the advice. Small additional question: Close up the water inlet valve of the engine whenever you stop the engine?:
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post #19 of 19 Old 08-28-2013
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Re: anti siphon valve universal m25

Some do, some don't. It's a hole in the boat that has the ability to fail. Whatever lets you sleep.
If you have a scoop type through hull fitting it is a good idea to close it when sailing so you do not hydro-lock the motor by forcing water into the engine through the exhaust system when under sail for an extended period of time.

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