Those appear to be your low point drains. directly above them inside there should be 2 valves. If turning them does not stop it then pushs them down gently on top till they snap closed. There are 2 types that are commonly used.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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