WINTERIZE

Does anyone put antifreeze in their black tank flush line ?

farmerrob wrote:
Does anyone put antifreeze in their black tank flush line ?

No, I blow it out. Never have had an issue.

farmerrob wrote:
Does anyone put antifreeze in their black tank flush line ?

always

I just winterized yesterday with the same delima. Since we use ours 12 months a year we winterize with air and put anti freeze in the p traps and black tank flush

farmerrob wrote:
Does anyone put antifreeze in their black tank flush line ?

Thought it was an open line into the black tank. Does it need anything?

Super_Dave wrote:

farmerrob wrote:
Does anyone put antifreeze in their black tank flush line ?

Thought it was an open line into the black tank. Does it need anything?

There is usually a back flow preventer in the line, besides at the hose connection. I just use compressed air to blow the line out.

djousma wrote:


There is usually a back flow preventer in the line, besides at the hose connection. I just use compressed air to blow the line out.

A backflow preventer is open in one direction from the connection to the tank so still not seeing a need unless I'm still missing something.

well, water is going to stay one one side of that preventer. In my Cardinal, the line goes from my water bay control panel, clear across and up into the area under my bathroom sink where the preventer is, and then down into the black tank. A quick blast of low pressure compressed air for 5-10 seconds is more than enough to blow the remaining water out.

Ok, so its not one way valve per se, its a vacuum breaker like this

Super_Dave wrote:
A backflow preventer is open in one direction from the connection to the tank so still not seeing a need unless I'm still missing something.

If there is any water remaining in the line to the nozzle, as there would be in a low spot in the hose routing for example, that water can still freeze and rupture the hose. Seems to me that blowing it out with air would be fine.

This coming from someone who lives in So Cal, and has never winterized any trailer before. But still, physics are physics.