Def tank locking cap

[Geezizin]

Does anyone know if someone makes a locking def tank cap. I’ve found 2 on Amazon but I think those are for semi tanks, haven’t checked the size yet.

[gSwift]

Is there a rise on DEF crime?  I mean we're talking like 5 to 7 gallons max. 

[davester]

Maybe the O.P. is more concerned with some idiot putting something into the def tank...

[bsmall1564]

Following, I also would like to lock my DEF Cap.  Looks like I might resort to a locking fuel door.

[pokismoki]

you still run the DEF tank?