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Hi my name is Robert.....
You should have some low point drains, many times you can see the lines underneath the chassis, some have caps you have to remove and others will actually have valves inside the RV they can be near the water pump, water heater etc, if you can not find them look outside for the drain lines then go inside to that area and look for the valves, after the valves are opened go ahead and start the pump, this will help push any water out of the lines, when the pump starts sputtering shut it off.
IF you need more steps on winterizing please let me know and I can go over that. Follow ups are included....
They will be small plastic valves some will have a handle you turn, when the valve handle is with the pipe it is open and closed when the handle is against the pipe, they could be under the sink, you would know when you open them if water comes out. Some have a ring you pull up on and it opens the valve up.... Robert
Sorry at this time I can not do a phone service, another expert may take the call... Robert
See picture below, I do not know EXACT location, could be under the sink, in back of the water heater or near the water pump, below are valves that are common that you would see as an example. IF you go outside you should see them under the chassis, go inside to that general area and look for them.
IF you want to try another expert on this please let me know, my goal is for you to be satisfied.... Robert
HI... Was just checking in to see if my answer helped??? IF you have more questions or concerns please feel free to contact me... Robert