Two Remaining Winterization Questions

[lacole]

I read through various threads on winterization and still have two questions. Hope I did not miss the answers --- not here to waste anyone's time!

Question 1: One of my questions was about how to get antifreeze into the waste tank flush line, but then I read that one poster bought a hand pump to pump antifreeze into that line from its outside connection. Is this a pump specifically for this application, and likely only available at rv parts supplier, or is it a general purpose pump, and available elsewhere? Also, does anyone know of any other method?

Question 2: When I start my winterization process I drain my gray tank, my blank tank, my fresh tank, and my low point drains. I then close all of them before I start winterizing. After I complete my winterization process (antifreeze method), I then redrain my gray and blank tanks. I am confused whether I should also redrain my low point drains. I know this would drain my lines of anitfreeze, but the traps and any other spots in the lines where liquid gets trapped would still have antifreeze in them. Thoughts?

Thanks for any insight that you can provide.

[Dave_Monica]

As a alternative, you can put a air nozzle fitting on the black tank flush line and blow it out with compressed air.

If you have added antifreeze and gotten pink at all the faucets it would be pointless to re-drain the lines.

Dave

[wyo700]

Is there a check valve in the black tank flush line that would stop the water in it from just draining into the tank. Cause I didn't do anything to mine. And from what I could see there wasn't a check valve or anything.

[lacole]

There is no check valve, but when I follow the water line inside the trailer is has some definite uphill runs and curves, where water will sit and freeze if not blown out or flushed out with antifreeze.

[Indy Steve]

Never thought about doing anything with the black tank flush fitting...I'm curious how many others actually blow this out or pump in antifreeze?

[BradinOhio]

I have always pumped antifreeze into the black tank flush fittings. Never had an issue with freezing.

[VinceU]

Originally Posted by Indy Steve

Never thought about doing anything with the black tank flush fitting...I'm curious how many others actually blow this out or pump in antifreeze?

Mine self drains when I take off the hose. The section beyond the vacuum valve is vertical into the nozzle. Seems unlikely any traps will occur.

[Playtime III]

Just don't forget the outside shower if you have one.

[tinkerreknit]

I haven't done anything at all to flush fittings in my 40 years of camping, and haven't had any problems. I am in central VA.

[Muskyman]

After draining black water tank. I hook up compressor to outside fitting for black water flush. I can hear water being discharged, however, since it is open to the atmosphere, don't know if it is really necessary. Just an easy precaution. I don't fill with antifreeze, since most of it would drain out. I use compressed air followed by antifreeze on all other water lines though.