Boy, not sure which Thetford you have there, but that's not a problem on
ours at all...

There is a little "green/red" gauge on the front of our Porta-potti. Green
= plenty of room in here, bombs away; red = grit your teeth, you should
have emptied me at the last rest area.

Also, there is no "vent" on ours. When the waste-entry gate is closed,
(with a completely full tank or not) you can shake, tumble, and roll the
container, and it doesn't spill a drop. There is a thumb-press operated
vent on ours that you use only when dumping, to break the vacuum. Again, no
chance of leakage, even when filled to the tippy-top.

G. Matthew Bulley
Bulley-Hewlett
Corporate Communications Counselors
www.bulley-hewlett.com
Cary, NC USA
888.468.4880 tollfree

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-----Original Message-----
From:   David Beierl [SMTP:dbeierl@IBM.NET]
Sent:   Friday, December 10, 1999 10:51 AM
To:     vanagon@GERRY.VANAGON.COM
Subject:        Thetford Potties

Something that occurred to me about Thetford Porta-Pottis -- before you use
one, open the flush gate and look inside to make sure the thing's not
already full.  Failure to observe this precaution can result in the toilet
equivalent of a LOCA (nuclear reactor Loss Of Cooling Accident)  because
there's a little vent in the top of the sewage chamber that opens along
with the flush gate.

:)
david
David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"