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Dumping the Waste Tank for Winterization
Okay, I want to make sure I’ve got to his straight. I’ll include two pictures to ensure I’m on the right track. It’s part of my effort to winterize the coach. I’ve already run antifreeze throughout the system.

Picture #1- I’ve labeled the two sources that can flow to the sewer system (or ground).
Picture #2 - The Main Dump Valve (usually air activated).

Dumping the waste holding tank utilizing left side plumbing bay:

Remove coach sewer pipe cap, attach sewer hose (slinky) to the connector next to the Main Dump Valve. 

Manually open the waste tank valve (in pic #1 the valve appears to already be open).

Activate Main Dump Valve to drain waste holding tank.

To rinse tank hook water hose to tank flush spicket in aft area of Aqua-Hot bay. Rinse until solids have moved through sewer pipe. 

Allow tank to thoroughly drain before closing valves. 

Run RV Antifreeze in sinks to allow antifreeze to enter holding tank via grey water pipe system.  Flush toilets to allow antifreeze to enter waste area of holding tank. 

If I understand the system this will also winterize the holding tank. 

Thanks, JK

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Kristi & Jeff 
2005 45’ Newell   #744
Bentonville, AR. 72712
If I dumped the holding tank prior to starting winterization I don't bother with any further dumping following winterization. The water remaining in the tank has lots of room to expand without causing damage. By itself, water freezing isn't a problem unless confined.
Jon Kabbe
1993 coach 337 with Civic towed
If the tank is full of waste will the ‘heat’ from the waste keep it from freezing? I’m worried about my coach sitting near Dallas, TX...
Karen & Adrian Abshire 
1998 2 slide 45' Newell towing a 2012 Jeep Wrangler Rubicon Unlimited and a 2006 Mercedes SLK320 for wifey. 
Prior: 1985 Foretravel ORED 35, 1988 38' Foretravel U280, 2000 Foretravel 42' U320, 1990 Bluebird Wanderlodge WB40
Doubtful that the 'waste' in the tank would be active enough to generate much heat over an extended period of time. You would be better off dumping the tank before storing it.
Michael Day
1992 Newell 43.5' #281
First hand experience. A full black tank will freeze solid as a rock.
Steve Bare
1999 Newell 2 slide #531

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