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Old 10-12-2018, 07:44 AM   #1
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winterizing black flush system

I have a Catalina 243 legacy. Looking for ideas to reliably winterize the black tank fitting and know for sure that the anti freeze got all the way to the tank. No problem doing the rest of the trailer. Just never had a black flush before.
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Old 10-12-2018, 07:54 AM   #2
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Thanks , every good question, i need to know too. Is there left in the check valve for Blk flush??
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Old 10-12-2018, 08:00 AM   #3
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Some will say that there is no need to winterize the black flush since it is an open line and will allow for expansion of freezing water. In theory, there should not be water left in the line but it does happen if the line has a sag in it.
I had a hose hooked to the outside shower that I ran to the black tank flush then ran the antifreeze through the shower into the black flush until I heard it spray in the tank.
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Old 10-12-2018, 08:07 AM   #4
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Some will say that there is no need to winterize the black flush since it is an open line and will allow for expansion of freezing water. In theory, there should not be water left in the line but it does happen if the line has a sag in it.
I had a hose hooked to the outside shower that I ran to the black tank flush then ran the antifreeze through the shower into the black flush until I heard it spray in the tank.
Agree with this method 1oo%! Nozzle area on Some RVS will/can retain water,that can Freeze! Youroo! !
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Old 10-12-2018, 08:15 AM   #5
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Just winterized the other night. When I was done with the pink stuff, I took my little air compressor and shot a couple blast into the hose connection. There's no check valve in the flush line and it's just blows any additional water into the tank.
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Old 10-12-2018, 08:18 AM   #6
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Did you purge the "City Water" connection ? There is a check valve in that connection that can hold water and freeze. I've replaced two on my brother-in-laws trailer. I always check with him now when he winterizes to make sure he purged it with pink stuff.
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Old 10-12-2018, 08:27 AM   #7
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blow it out with air, ... I don't/never have, used the anti freeze, ... we're able to camp several times during the winter, and using the anti freeze would require, flushing it out of the lines every time we want to use the trailer for a weekend and then redoing it when we get back home, ... much less trouble for me to hookup my air line, blow 20-30 lbs of air thru the whole system, plus the black tank flush line and the outside shower lines, until all water is removed, ...

"if there ain't no water in the lines, there ain't nothing there to freeze" ....
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Old 10-12-2018, 09:04 AM   #8
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Some will say that there is no need to winterize the black flush since it is an open line and will allow for expansion of freezing water. In theory, there should not be water left in the line but it does happen if the line has a sag in it.
I had a hose hooked to the outside shower that I ran to the black tank flush then ran the antifreeze through the shower into the black flush until I heard it spray in the tank.
Exactly what I do... Hook a hose from the outside faucet to the black tank flush.
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Old 10-12-2018, 01:53 PM   #9
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I winterize my entire camper with compressed air. Compressed air will work well on a black tank flush as well. Any compressor will do the job on the black tank flush. And, for years, I got by (struggled) with a pancake compressor to winterize the RV. I had to wait patiently for the compressor to repressurize then I'd connect to the RV and give it a burst of air, then disconnect and wait. Now I have a 30 gallon, 175 PSI compressor, and it has an "endless" supply of air.

On all compressors, set the output PSI to about 40 PSI...same as your city water pressure regulator...to prevent blowing up your RV plumbing. At that output pressure with my "big" homeowner's compressor, I'm almost done winterizing the entire RV before the compressor comes on to refill the tank. I also do NOT have to switch my hot water heater to bypass, because, after I drain and re-plug the hot water heater, the huge amount of air from my compressor just fills and pressurizes that 6 gallon tank with ease. Easy as can be. The compressor has lots of other uses, including filling the RV tires to ANY pressure, so it was $350 well spent.

I DO put RV Antifreeze in my drain traps and down the toilet flush (and a tiny bit in the bowl), and in so doing, overflow past the traps/toilet enters the black and grey tanks and protects the dump valves and dump plumbing. I never "contaminate" my fresh-water supply with RV Antifreeze, so we can roll out on a moment's notice if we get a balmy weekend in mid-winter.

Aside from the hassle of having to open/setup my PUP to get the job done, it takes less than 30 minutes to do the whole job.

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Old 10-12-2018, 02:11 PM   #10
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Just blow it out with 30psi air
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