When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I just bought a set of glad hands and the emergency/supply glad hand will not work on my old trailer. There is a nub on the emergency that is not on the control glad hand and that nub keeps the hands from mating. All the pictures I can find show the nub on the red hand and no nub on the blue. I would like to know why the change and when.