This new coupler plug is a 1/4 body standard Industrial Style coupler plug with 3/8" FNPT . This high quality steel plug made by Prevost and are made in Italy and meet the highest standards for quality and performance. These are some of the most durable, solid steel plugs that you can find. These plugs are more resistant to crushing and marring when being dropped, which is important because a quality plug can increase the life of your couplers!