Searched around a bit, to no avail...
Last year when winterizing I ended up just using black tape to connect a hose from the water pump into
a pail of Antifreeze as so....
My trailer isn't handy to check things out. I'm wondering what size tubing I would need to connect to the
water pump (for siphoning from the pail of Antifreeze) as I have done in the photo with a water hose last year.
Might be less prone to leaking.