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post #13 of Old 03-27-2004
GordMay
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Holding Tank

Vented Loops on Below Waterline Heads:
If the Head is installed below the waterline, or may be below the waterline at any angle of heel (virtually always on a sailboat) - properly positioned Vented Loops must be installed.
Vented Loops should be installed on BOTH the Raw-Water Intake Line, between the Intake Seacock and the Head - AND - also on the Head Discharge Line between the Head and the Holding Tank.
ADDITIONALY, a Vented Loop should be installed in the 3/4" Hose between the Toilet Pump and the back of the Bowl. The factory-installed 3/4" Hose must be removed, and a new (longer) Hose c/w Vent installed.
The top of all the Vented Loops must be (about 8") above the waterline at the greatest angle of heel.
See:
http://www.raritaneng.com/pdf_files/compact_II/L219compactIIv0502.pdf
and
http://jabsco.com/prodinfo/overview/43000-0686_ds.pdf

Of course, sub-standard installations abound - and most of them work just fine - and havn''t sunk their owner''s boats. So maybe these Loopless schemes are "good enough".
Or you could do it right.

OMHO
Gord
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