Its very common for the Bathroom sink to drain into the Black tank - that helps keep the black tank flowing better (when draining). Many new RV'er dont keep enough water in the black tank which will cause problem down the road. Mine does the same thing (2017 Axis).
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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