Perlick Low Profile US Sankey Keg Coupler, D System US Sankey coupler that is made for when you have a tight squeeze at the top of your refrigerator This coupler will only stick up about 3/4-inch above the top rim of the keg The beer line would screw onto one side and the air line slides over the nipple on the other side This coupler will fit just about any beer brewed in North America Fits d system keg valves