Andy,
Welcome to the school of hard knocks (apparently those at Thor enjoy keeping some things a secret). There is a plate on the floor of the cubical that houses your gray and black valves, it is below the valves and it unscrews (eventually and with enough effort) and can be put aside.
Then the hook-up center piece between the gray and black tank valves will rotate forward and point down out of the hole. Be sure both gray and black valves are fully closed (rest assured you will only make that mistake once) for you see on my Vegas you have to take the cover piece off of the part that rotates or else it binds on the floor of the cubical.
Gloves, eye protection and a mask makes for a much safer draining of the gray and black water.
Doc
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Sheree & Michael NCNG LTC(ret) with Munpi, RC and Sheba (cat).
2019 Nexus Viper 27V, E-450, 5 speed "Ms. Enterprise", Infotainment Center, HUD, , Safe-T-Plus, Curt SpareTire Mount, ext. WiFi Antenna, Roadmaster Tow Sys& Invisibrake.
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