Dear Mr. Scurrilegs,

At 02:34 PM 6/18/2010, Mike \"Rocket J Squirrel\" wrote:
>crap under there for me to want to find out. I presume it's a
>breather/overflow line for the tank and possibly dumps into the sink
>drain line? Just a guess. But anyway,

Should vent to the outside via a hole in the fill panel.

>Any tips or better ideas before I proceed?

Yes.  RTV isn't going to stick to that polyethylene tank.  Use
something that stays sticky, or break down and get another
grommet.  I got some sticky gray stuff from local RV dealer, I
*think* it's used to seal rooves.  But it worked a treat sealing the
bellows on my Porta-Potti where it plugged into the base.

Yrs,
d