Winterizing the black tank "flushing" rinse.

I usually use the air compressor to flush out the black tank rinse on our trailer. I forgot to do it this year and wonder if it is necessary to do this as the trip out to the trailer is about 100 kms. Has anybody ever had an issue with not doing anything with this line in the winter.

The first couple of years that we had our first Bighorn I did not blow out that line.
I had no problems, but I do blow it out now.

Peace
Dave

It might only be a problem if you have a check valve at the inlet. Any water in the line after the anti-siphon valve hidden who-knows-where will drain into the tank. My original inlet did not have a check valve, only a plastic flow reducer. When it broke, I replaced it with an actual brass city water inlet with check valve.

So now I either press the check valve "button" and drain it, or use low air pressure, or both. No problems with it.

I have never winterized the black tank flush and never had a problem.