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Old 12-22-2012, 01:27 PM   #1
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Winterizing black water tank flush line

Other than getting pink through all the water lines during winterization has anyone every blown any pink into/through the black water flush line? I've been winterizing RVs for 25 years (8 years with the current DP which has the flush line for the black tank) and have never done this. I am always sure the plug for the line where the hose would connect is out so any water can drain out of that end but not sure what happens on the other end past the check valve into the tank. Does that line continue to slope upwards into the tank or would it tilt downward thus also draining any water left in the line out into the tank? Questions I've just never thought about or incurred before.

I read on one of the Posts that the person recommended doing this as his line had frozen and had to be replaced.

The service tech at one of the RV shops in town said they've never done it.

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Old 12-22-2012, 01:37 PM   #2
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Interesting question. We've never done any of ours and they seem to always work every year. Probably could take one of those hand pumps that one can buy for $15 or so and maybe give it a squirt or two of the pink stuff.
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Old 12-22-2012, 01:38 PM   #3
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I just blow air in mine to get the water out.
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Old 12-22-2012, 01:42 PM   #4
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No mention of it in the winterizing section of my owners manual either.
You sure there's a check valve in the line? Seems to me you get some water flowing out after disconnecting the hose .
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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Old 12-22-2012, 03:02 PM   #5
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Always wondered if the tank got too full would it overflow out that flush line but when the Poster mentioned the check valve I thought "so that's the reason only clear water runs out when I disconnect the hose".

I was going to either blow it out or put some pink in a short hose then put my blow-out-plug (if I can ever find it) on the end of the hose and hook my air pump up to it.

Has anyone seen a diagram of the tank showing how the flush line connects into it, whether high up on the side or into the top of it. You can tell the winter blues are getting to me already and trying to keep active with these nonsense questions. Please bare with me.
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Old 12-22-2012, 04:55 PM   #6
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I would think that's brand specific and/or age model of the individual coach.

My runs to the tanks are very short. When I disconnect the hose and open the valves, the extra water runs out. If ever in doubt, I would pour pink stuff in the hose and shoot some in.
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Old 12-26-2012, 09:03 AM   #7
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Originally Posted by SMRDNR View Post
I just blow air in mine to get the water out.

On our Fleetwood, there is a check valve, and it is impossible to get to. If you don't blow out the line, you risk the check valve freezing.

Don't ask me how I know......

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tank, water

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