I learned my bathroom sink drains to the black tank by dumping a glass full of water into the sink while I held the toilet flush valve open (with water pump off). If you can clearly see or hear it cascade into the black tank, then you have your answer. Good luck.
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2005 22' BT Cruiser 5211, Chevrolet 3500 chassis w/6.0L Vortec V-8; 6'x12' Cargo Trailer; Honda CB500X motorcycle for street and ADV riding; Yamaha TW200 motorcycle for dual-sport and trail riding...All of it for fun and adventure!
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