I have always winterized my own units, because they were small....I just hooked up my air compressor and blew out the lines, and added antifreeze to the drains and p-traps.
But now I have a larger, more modern, trailer that has an outside 'antifreeze port' , so I thought I'd give it a try.
Where is the 'valve to the tank' and where is the 'valve to the inlet'? No diagrams in the owners manual!!!!
In the middle of all the instructions, it says to turn valve to the 'off' position...it's not marked so I couldn't tell if it was on or off!!
And none of the tubes and hoses are marked and there is no diagram to go by, so I guess it's back to the old way of winterizing for me....none of this new, easier way!!!
I hate instructions that are 'as clear as mud'!!