</font><font color="blue" class="small">( Hey, this is a slick product. Pete, which one do you have, conductive or non-conductive ? I would think the non-conductive one is the way to go but not sure if you get the same filtration. Also seems strange that the non-conductive one is cheaper by 4 bucks. )</font>
I have the non-conductive. I gather that the conductive one is a safety measure for airplanes and boats, in that the conductive material can't build up a static charge that could possibly make a spark. My guess only, since I'm neither a pilot nor a boater, but I deem that risk on my tractor to be small to negligible.
For the other poster, I bought mine online direct from the manufacturer since the local Home Depot did not carry them.
Pete