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Old 05-28-2008, 12:10 AM   #1
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1976 31' Sovereign
Boise , Idaho
Join Date: Apr 2007
Posts: 1
Help me with a question!

We have a 1997 34' Excella 1000 trailer, and on top, it has a vane looking apparatus that moves slowly. When I notice it, it is in a different position even when the trailer is parked. What is it?

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Old 05-28-2008, 01:44 AM   #2
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1978 28' Ambassador
Morada , California
Join Date: Jan 2006
Posts: 1,583
I believe you have a 'vane' type of cap that covers the plumbing vent pipe. These are sold as an aftermarket item...I've even seen them at Wal-Mart's RV parts area.

Cyclone Sewer Vent - Camping World

They are supposed to rotate with the wind and cause a small 'suction' or air pressure change that will allow air flow up from your holding tank and vent it 'down wind' no matter which direction you are parked.

I have one on our Lance Camper and it seems to work as advertised. I don't plan to install one on our AS, however, as I like the Alum cap that matches our rig.
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