I read an old thread here that described filing a groove on the drain fitting that held the drain plug more stable and prevented it from slipping off the stop and closing while you are brushing or something else.
When you want to close it, just lift and rotate it a few degrees and it will drop down and seal.
I worked for me.
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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