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post #1 of 4 Old 01-17-2006 Thread Starter
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vacuum break in head plumbing

I''m plumbing the head in my new 1970 38''Irwin,I can''t recall if the vacuum breaker goes between the Y valve & the seacock or between the head & the Y valve. Between the Y valve & the seacock seem to make more sense to keepfrom syphoning the whole ocean into my head. I saw a diagram on this somewhere,but can''t seem to find it.Any one know? Thanks in adv.
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post #2 of 4 Old 01-18-2006
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vacuum break in head plumbing

If the head is installed below the waterline (as recommended), there are TWO vacuum breaks (vented loops);
First one 3/4" between the flushing pump & toilet bowl
Second 1 " between the toilet waste discharge & Y valve (discharge seacock or holding tank).
All loops must extend at least 8" above heeled waterline. The waste loop should be as close as possible to the toilet, thus reducing the length of unflushed hose.
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post #3 of 4 Old 01-18-2006
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vacuum break in head plumbing

Ive posted a crude Marine Head Plumbing Diagram, showing the Vented Loop locations etc, on the CruisersForum, at:
http://cruisersforum.com/photopost//editphoto.php?phoedit=1553
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post #4 of 4 Old 01-18-2006
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vacuum break in head plumbing

Sorry - the diagram is at:
http://cruisersforum.com/photopost//showphoto.php?photo=1553
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