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Old 03-04-2020, 12:55 AM   #1
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Something else to worry about!

Do you winterize your tank flusher? Got back from Florida and went to use my tank flusher. Didnít work! Water sprayed into the bathroom and filled a basement compartment with about an inch of water before I noticed that nothing was coming out the sewer drain and went to investigate. What a mess. Near as I can tell the flush line had water in it that froze and burst over the Indiana winter. Never thought to winterize it before. Alas, thereís no getting at the PEX line and itíll be VERY tedious or impossible to replace the back flow valve in the side of the tank. I hope itís the PEX line that burst though as routing a new line is pretty doable but I think PEX can take some freezing so research is in order. Sigh!
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Old 03-04-2020, 01:04 AM   #2
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Yeah, PEX is pretty resilient to freezing - more likely an ABS fitting cracked.
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Old 03-04-2020, 08:12 AM   #3
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When winterizing I use an air compressor to blow out all my lines, including the tank flush line. I use pink stuff for the water pump and drains but just air for everything else. PEX is pretty tough stuff but it will break if there is enough water and really low temps.
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Old 03-04-2020, 09:12 AM   #4
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I haven't winterized my San-T-Flush.... if that is the flusher your talking about.

I need to double-check mine but I believe that there is a flexible hose where the water connected going to PEX and then to the black tank. There is a vacuum breaker valve along the way to prevent a back-flush from occurring. I believe it is located in the bathroom wall behind the shower.

Plumbing bursts usually from there being water under pressure in the system. As the water expands there is nowhere for it to go and the weakest point splits.

With this system being open on both ends, I would think water could expand without pressure building and causing something to burst.

You might want to check your plumbing schematics. If it is plumbed like I mentioned with the vacuum breaker valve, that could be your issue. Thor has had issues with it in the past. I had an Outlaw 29H where it was either plumbed backwards or was defective and the first time I hooked up water to flush the tanks it flooded in the inside of the coach.
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Old 03-04-2020, 11:45 AM   #5
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Third motorhome in ten years and all three had a black tank flush system. I have never winterized the black tank flush and have never had anything freeze even when temps got down to -15 degrees. I do however, blow them out with low air pressure when I de-winterize the coach making sure there are no issues before connecting a water hose.

I did have a vaccum breaker fail but that was in the middle of summer and the failure was the breaker would not open to allow water to flow into the tank.
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Old 03-04-2020, 12:23 PM   #6
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Ouch! I never even thought about that one...
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Old 03-04-2020, 04:17 PM   #7
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Originally Posted by Bob Denman View Post
Ouch! I never even thought about that one...
Me neither!
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Old 03-04-2020, 11:37 PM   #8
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Started diagnosing today. I found the air gap device under the bathroom sink and next time we get a nice day Iím going to try putting a small amount of air pressure in the system and see if I can find a leak maybe using soapy water. Donít think thatís the issue though because most of my water ended up in the basement storage compartment and not in the bathroom. Iíve never winterized the tank flusher before and not had a problem so maybe something just broke. Iíll find it and Iíll let yíall know.
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Old 03-05-2020, 12:07 AM   #9
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Try grape koolaide
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Old 03-20-2020, 10:27 PM   #10
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Thought Iíd circle back to this with an update. Finally had a nice day and, like everybody else, I seem to have some time on my hands.... so I did some more diagnostic work. There is a leak but itís inside the wall where I canít reach it. The PEX line comes across the coach through the basement then goes up inside the wall to the air gap device under the bathroom sink before coming back down to the actual flusher on the black tank. I might be able to fish new lines up to the bathroom but it would be easier to abandon it and start over. I could put the air gap device behind the fridge or in the compartment with the furnace. BUT I have noticed that after market flush valves do not use the air gap at all, relying instead on the back flow valve at the tank. It would be a lot simpler to just run a single line from the hook up directly to the tank flusher. Any thoughts on that idea?

Thanks
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