Did You Winterize Your Black Tank Flush?

[nomad297]

I'm just wondering how many people never thought of doing this. After all, the line from the outside of the RV to the vacuum breaker inside is full of water. Beyond the vacuum breaker and into the black tank should have no water present in the line as the vacuum breaker allows that to drain.

I never thought about it until just now, so I am taking a 5 hour round trip this weekend to do it. I Hope I'm not too late.

Bruce

[youroo]

Ours has No water located between the RV side wall and up to the Anti siphon/check valve! My main concern is the spray Nozzle freezing,I feed RV anti-freeze threw the BTR from the O/S shower,when Winterizing! Youroo!!

[nomad297]

Originally Posted by youroo

Ours has No water located between the RV side wall and up to the Anti siphon/check valve! My main concern is the spray Nozzle freezing,I feed RV anti-freeze threw the BTR from the O/S shower,when Winterizing! Youroo!!

How does yours have no water from the connection to the vacuum breaker? My inlet has a check valve at the connection as well as at the vacuum breaker. But, if you put antifreeze in there, you have nothing to worry about anyways.

Bruce

[youroo]

No check valve at the wall,but I have also always used a Back flow preventer on our BTR hose! Youroo!!

[davel1971]

I blow mine out with air

[spock123]

I'll check mine out today, thanks


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[bubbles]

This is a typical rv install of the black tank flush system. It's a self contained system and only one check valve. After flush water on tank side will drain into tank (tank is vented) and water on input side will drain back out input port (not contaminated water). I guess some installs do also have a check valve at input port but don't understand why.

[youroo]

Originally Posted by bubbles

This is a typical rv install of the black tank flush system. It's a self contained system and only one check valve. After flush water on tank side will drain into tank (tank is vented) and water on input side will drain back out input port (not contaminated water). I guess some installs do also have a check valve at input port but don't understand why.

Thats the way our's is plumbed! It even says "No check valve should be added to the Input side" Youroo!!

[nomad297]

Maybe I'll chance it and save the trip this weekend.

Bruce

[Black]

I just blow air in the line.

[offduty11]

Same here

[RudysWorld]

I blow mine out along with fresh water fill.

[howie70]

I never gave it a 2nd thought when winterizing but bubbles post above helps ease my mind.
I'm curious, how would one get antifreeze in there if you did want to winterize it?

[jeff64]

I would be more concerned with a "closed" system than an " open" system. With trapped water in a "closed" system the water has nowhere to expand to... and something will crack, hence the use of RV antifreeze. With blackwater flushes, check valves and spray bars, this is an open system with the effects of gravity and no resistance to water just laying in the tube. I don't believe the amount of expansion of a drop of water here will matter.. lots of air space.

I used to just blow the lines with air on my PUP that had a shower /toilet combo and after 13 years never an issue.

[gunpro]

I live here in the great white north where it gets down to -30C and lower. Never crossed my mind to winterize it and have not had a problem , "yet"

[CWSWine]

I pump anti freeze out my outside shower then attach that hose to my black tank flush and pump the anti freeze though the black tank flush.

[Harkerr]

Never had a problem. Seems to take care of itself

[Big Bill]

Iuse a pressurised canister to force AF thru the flush line, also thru the city water connection, and the fresh water tank fill line, then use the suction line and 12v pump to do the rest of the system