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Old 03-21-2013, 10:06 PM   #15
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Join Date: May 2002
Location: Idaho Falls, ID, USA
Posts: 351
On my Hitchhiker II the black tank vent exits under the Refer vent cover, so I only have one (gray tank) vent visiable on the roof.

2005 Dodge, 2500, auto, 2wd. Pac brake PRXB. CB, Max Brake Brake Controller, Rhino Lining, Aero 60 gal. replacement tank.
1998 Hitchhiker ll, mod#31RLBGBW, RBW L'tl Rocker Hitch, Generac NP50 G generator
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Old 03-23-2013, 06:28 PM   #16
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Join Date: Apr 2005
Location: Lynchburg, VA
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As BirdDoggin sugested, the problem might be pressure building up between the valve and the cover. It could also be a blockage further up above the valve that was just partial and temporary. I bet it never happens again. I don't see the need for any additive at all for the short-trip RVr, but I don't know your circumstances or lifestyle. Additives aren't good for odor control and you don't need to break down wastes if you will dump frequently. I have never once in 40 years used any lubricant for the valves.

A proper quick, brave, steady, ready gentleman!
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