No way to know for sure they drain out. There can be some distance and many places for water to get trapped in those lines in low spots on the horizontal runs.
I use my outside shower hose and pump a shot of antifreeze through them. Better safe than sorry and it only takes a few seconds.
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2021 Keystone Cougar Half-Ton 32BHS 5th Wheel
2022 F-450SD, Lariat Ultimate, CC, 4WD, FX4, Rapid Red, Curt A16/R24 Slider
Upgraded: 2020 F-250SD, XLT Pre, CC, SWB, 4WD, FX4, HCTP, 6.7 PSD, 3.55 e-lock, Blue Jeans Metallic
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