Quote:
Originally Posted by GregWeld
DO NOT loop it -- that effectively makes a "P" trap out of the vent line and any "fluid" would sit in the bottom of the "loop" and any pressure behind it would push that fluid up and out of the vent. The fluid in the loop would also block any incoming "make up" air.
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BINGO, You are exactly correct. This will not be done on ours. I added a -6 vent fitting to our tank as well as the vented cap. Hopefully it is enough.