[C320-list] Fresh water system winterization

[wdoc1 at aol.com]

 Shipmates-
Considering adding "T" connectors to the lines from forward and aft water tanks to facilitate clearing the lines with compressed air/winterizing with antifreeze. 
Anyone have suggestions re fittings, location? 
Would a 10 gallon compressed air tank be sufficient to blow the water out of the head, head sink, galley sink and shower? What kind of fitting for the air line?
Thank you,
Bill McConnell2000 C320 #714, Diversion