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Old 10-14-2016, 08:31 AM   #1
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Probably a dumb question, but after a year I am still learning...

How do I completely drain the fresh water from the holding tank? I guess I could turn on the galley and bathroom sink faucets and let them fill the grey tank, then take to the local campground dump station, but it would be easier if I could let the fresh water drain down the driveway. I am still a newbie!


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Old 10-14-2016, 08:36 AM   #2
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Low point drain

Look for a low point drain...If you can find it check your manual...If you can't find it use the out shower.
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Old 10-14-2016, 08:38 AM   #3
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Look for a low point drain...If you can find it check your manual...If you can't find it use the out shower.
Beat me to the answer by 2 min LOL

When we had our 5er, there was a petcock clearly labeled on the underframe "Low Point Drain" - just turn this and it will completely drain your fresh water tank
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Old 10-14-2016, 08:51 AM   #4
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Beat me to the answer by 2 min LOL

When we had our 5er, there was a petcock clearly labeled on the underframe "Low Point Drain" - just turn this and it will completely drain your fresh water tank
A low point drain is not a holding tank drain. Low point drains are supposed to be the lowest point in the water lines (could be one each for hot and cold lines) to allow expelling residual water in them. The holding tank drain is strictly for the holding tank. This is sort of standard but of course there is always the exception. The OP should be able to find a dedicated holding tank drain.
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Old 10-14-2016, 08:54 AM   #5
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Beat me to the answer by 2 min LOL

When we had our 5er, there was a petcock clearly labeled on the underframe "Low Point Drain" - just turn this and it will completely drain your fresh water tank
Low point drains don't necessarily drain your FW tank...they drain water that's already in your plumbing. To drain your FW tank, you'll need to find the FW tank drain, which will likely also look like your low point drain, but may be in a totally different spot under your rig.

Of course, if you're winterizing, you want to open both. But don't just open your low point drain and think you're draining your FW tank, it doesn't work that way.
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Old 10-14-2016, 01:54 PM   #6
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Not going to winterize it. There is still about 1/2 tank of fresh water I filled with a month ago for a short trip. Although I bought water fresh stuff at West Marine, I still haven't added it yet. We had some very warm days this month so I don't want to take a chance with bad water now.
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Old 10-14-2016, 02:22 PM   #7
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Crawl underneath and look for a tank drain. Should be a small valve hanging out somewhere in the area of the tank.
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Old 10-14-2016, 03:04 PM   #8
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A lot of tanks have a drain fitting under the trailer, usually just a pvc type fitting with a cap you can unscrew to drain. I changed mine to a small valve which I open as I leave the campground. Doesn't take long to completely empty the tank.
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Old 10-14-2016, 03:37 PM   #9
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How do I completely drain the fresh water from the holding tank? I guess I could turn on the galley and bathroom sink faucets and let them fill the grey tank, then take to the local campground dump station, but it would be easier if I could let the fresh water drain down the driveway. I am still a newbie!


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I have a Forester so this should be the same valve as you. Inside the passenger side compartment where the air bag fill is you will see another compartment door. Blue hose with the green valve. Open it and the fresh water tank will drain very slowly. If anybody is curious about the black wire at the bottom of the picture it is my water alarm purchased for about $10 at Lowes.
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Old 10-14-2016, 10:41 PM   #10
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Low water drains are co-located with the field mouse entrance (see emm's picture).
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