Should be located under the fridge. There is a floor level access panel. My 2013 did not come with a winterizing line. I had to make my own and disconnect the fresh water intake.
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2013 Salem 30KQBSS TT
Equalizer 4pt Hitch system-12K
2016 Ram 1500 Crew Cab Sport 5.7 Hemi w/8 Speed
I found that a household handheld shower hose screws perfectly onto the pump intake from the tank, I dropped the other end in a gallon of antifreeze and viola.... I had a spare hose in my plumbing box and it looked like a close match so I tried it.
Make sure you have the rubber washer still in the shower hose end that you put on the pump , otherwise it won't pull suction... Don't ask how I know..... :-)
My 2015 is under the fridge and I had to put the winterizing kit on myself.
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Retired Fire Dept Battalion Chief
2016 Ever-Lite 232RBS
2012 F150 FX4 W/Max tow & Ecoboost (Best tv ever)
2018 F250 Lariat (ok but I miss my F150)