As far as I know, all water heaters have a bypass system on them. Generally they are located at the back of the WH. They generally have a two valve arrangement, but there are some trailers that still have the three valve arrangement. Here is a picture of the summer and winter valve configurations.
__________________ Cheers Helen & George VE3INB and Max (Bichon Frise) 2006 Silverado 2500HD D/A, 2006 Cruiser CF30SK
I think he is asking about the winterizing kit (you know the piece that ties into the system to suck up the antifreeze.) Not sure if this is in the convenience kit or not. I know my zinger came with it but not sure if it was a dealer or manufacturer thing.