I think we have another case of where the OP has checked out....never did respond as to which rat proof feeder they had that was not working........but since there is a following of certain aspects of this thread........perhaps this might be of interest...
So zappers don't work? Expect the same with traps.
#2: Was this the rat proof feeder from Oklahoma? If so, did you follow the install instructions exactly? I repeat......exactly?
If not, which one is it?
Process remains....
1. Sanitation (eliminating sources of food, water and shelter)
2...