Their is one in back of utility storage and one on passengers side second bay from rear of rig. You have to get on knees and look to back right, should be a valve there. Hope this helps.
There are also a couple low point drains on the drivers side in the compartment with the plumbing hook up's. I think ours has 3 total with the one on the passenger side compartment. That one should be marked with a decal and arrow, you just have to duck a bit to see it.
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