Winterizing kids Cruiser. Hot water tank question

[ivbinconned]

Our old Skamper and our newer Cedar both have 3 valves at the hot water tank. The tank is isolated by closing the in line and the out line. The pipe joining the two lines has a valve that is then opened for winterizing.
I didn’t have to tell you all this because you already knew it.
The kids Cruiser has a valve on the in side at the bottom...but no valve at the top out line??
There is a valve on the pipe between the two lines as I would expect but if it is open wouldn’t the tank then fill from the top.?
I’m confused.

[ivbinconned]

Ah. Thank you.

[Old-Biscuit]

Nether Suburban or Atwood ship their Water Heaters with vlaves
RV MFG desides how many valves and/or check valves will be used n the installation'

Some use 3 valves, some 2 valves & check valve, some 2 valves and 2 check valves

Kids Cruiser has 2 valve with check valve system
Cold inlet valve, Bypass valve and Check Valve in the nipple in Hot out at top of tank

[DutchmenSport]

There is an in line check valves to prevent water backflow on the top hot line.