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Old 04-30-2002, 08:50 PM   #1
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Question White water tank drain

I have a 1975 Excella 500 and would like to drain the fresh water tank . Is there a way to do this without pumping it out with the trailer water pump?
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Old 04-30-2002, 10:13 PM   #2
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Removing water from any tank.

It is possible to remove water from a tank by several methods, depending on how the tank is plumbed. The first method is to pump tank with RV pump as installed. Next is to pump with 120volt booster water pump, or connect source of air to fill inlet and allow water to be pushed out any water outlet on sinks or tub, or finally connect a large container that is connected to vacuum pump and suck out holding tank. A refrigeration vacumm pump does a great job for this task. The fitting for using air to blow out the air is available at Wally world and most rv places. What is the problem requiring the removal of water??
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Old 05-01-2002, 05:46 AM   #3
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Thank you for the help and infoemation,
As to why I need to drain the tank. I purchased the trailer in February at the time the white water tank was 50% filled with a water antifreeze mix, I need to get that out so the tank can be filled with drinking water.

Thanks again,
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Old 05-01-2002, 06:20 AM   #4
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If you have the owners manual you might be able to find where airstream installed a valve to drain the tank. It is usally under one of the mid coach cabinets and my be below the level of the floor. If you look under the trialer in the middle you may see a blck tube sticking out thru thre skin. Not the one in front of the roadside wheelwell, this is the AC drain, but just like it. the drain valve is above that tube inside the rig. Good hunting.
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1978 Argosy 28 foot Motorhome

Wise men talk because they have something to say; fools, because they have to say something. -- Plato

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Old 05-01-2002, 10:08 AM   #5
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If you dont see a tube as suggested look for a square panel maybe 5x5in drill out the rivets and there may be a screw drain plug on the tank. You can remove the drain plug and make a drain tube using the same size threads and a tube that extends below the skin. Thats how I found the one on my Excella.

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Old 02-19-2024, 04:08 AM   #6
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I have a 1975 Sovereign 31' Airstream. There is a hole in the underbelly. When water is put in for the holding tank it runs out this hole. It is on the door side by the front axle. Any reason this hole is here?
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