Yes, I did it that way for years when I used a porty, also it helps to run anti freeze through the unit
(DA!) but thing is you can use el-cheapo windshield wash, it's safe against freeze to -25 degrees, never had a problem with freezing doing that, just use a drain line to drain off the ww before using
(DA!) you can reuse it a few times too as long a the color of the ww stays consistent with it's original color. Hope this helps, stay warm.
Good point about the QD, mine always seemed to be stuck open on the top anyhow, so it wasn't a concern, but good point