After getting a full tank taken out of my Jeep the night I filled it up a while ago I got one for both the Jeep and the truck. Stant is what I have also, they work great, just make sure that they work before putting them on, the one that I got for my truck would not unlock, good thing I tested it first.

 

They don't really do much but make you warm and fuzzy, three companies around were I work including ours had gas stolen last weekend. Our vas are inside a locked fenced in area, and they either cut the fill hose under the van or beat a hole in the bottom with I guess a hammer and screwdriver, took about 300gal from three companies.