On our Alpine, the drain handle for the kitchen sink grey tank is in the water "convenience" center, and one has to pull it straight back to open it.
The water "convenience" center is on the left (sidewalk) side of ours.
Hope you find the valve on your Challenger so you can use the sink again!
Take care!
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Gary & Deb (44 years)
RV: Keystone 2013 Alpine 3495FL
TV: 2014 RAM 3500HD Laramie Long Box, 6.4 HEMI, 4x4, 4.10's, with Mopar Puck system, and a B&W Companion hitch.
Retired Firefighter/EMT.
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