Welcome to the forum
The top picture is your gravity fill for the fresh water tank.
Bottom picture, black tank rinser is the bottom hose connection.
Third gray tank drain handle is often tucked up along the frame on the drivers side, sometimes behind the wheels.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.