Slip DEFBooty over the DEF cap of ANY Tier IV Final piece of equipment. When you go to refill the DEF tank simply remove the disposable DEFBooty and replace with a new, clean DEFBooty. Simple.
This is a DEF tank cap attached.
This is a disposable DEFBooty over the DEF cap. It maintains a clean DEF cap and surrounding area.
This is an example of the contaminants that could potentially enter the DEF tank without the DEFBooty.
When the DEFBooty is removed, the DEF tank cap and surrounding area are contaminant free.