Bypass Valves

[jaimeandmatt]

Hello, This is my first forum registration so I am not sure if I am doing this right or in the right place. My wife and I just purchased a Heartland Sundance 3700RLB 5th wheel. We aren't strangers to camping as we owned a Keystone Laredo before but this camper is different and doesn't appear to have easy access to the bypass valve for winterizing. Does anyone have any idea on this?

Thank you