winterizing a 381fl columbus

[boatnik]

has anyone out there done this themselves. I blew the lines out with air and ran antifreeze thru the whole system. my question is how to blow out the black water flush. any help would be great

[youroo]

I adapted the outside shower hose to pump Anti-freeze into the black tank rinse fitting! Youroo!!

[boatnik]

I take it that the black connector is just a flush line totally independent from all other lines, and that you cannot syphon from this port.