Winterizing question on 2005 RE3

[2 DA WDS]

When I winterized my unit last night I though I noticed something different. Lets see if I can describe this correctly.
There is a 'T' between the water pump and the fresh water tank. There is a hose coming off the 'T' that gets stuck in the jug of antifreeze. That hose has a shutoff valve between it and the 'T'. There is a shutoff valve between the 'T' and the water pump but not one between the 'T' and the fresh water tank. It worked but shouldnt there be a valve between the 'T' and the fresh water tank? I thought that was where it was on my last unit.