Bath/shower drain valve

[wigwag]

Help! I’m in a remote area with very little wifi, and a local plumber who is MIA.

I have a 64 Overlander with a tub that won’t drain. My plumber says that there are two valves in the back. I know about one of them, and it’s open, but for the life of me, I can’t find the second. Apparently, this is the one I need to open? Where the heck is it?

The service compartment is completely chaotic, what with things having been replaced and disconnected. If anyone has a pic of what I’m looking for, I’d be so appreciative!

Thanks, from a total idiot.