Winterizing Solitude antifreeze bypass?

[The_Mit_375RE]

Hi everyone,
We have a 375RE and in a month I'm going to winterize it for first winter. I have seen videos from my dealer saying just connect a hose to water nozzle and turn dial to winterize and turn on pump and your ready to flush the lines. But... Dealier in parts told me I need the by pass valve to connect after pump and then run my antifreeze through by pass. I'm confused I'm getting two different stories from my RV place. Please advise. Do I need to locate my pump some were under a panel and put by pass valve in like he said. Or can I just get a hose connect to water line in utility box other side of hose put in antifreeze container turn dial to winterize and turn on pump inside and start to flush?

Thanks everyone. ��