5 x Neoprene Coupling Washers [Kegerator] + Keg Parts Roundup Beer Line Neoprene Coupling Washers. Set of 6. These go between the tail piece and shank in a typical kegerator setup. Beer Line Neoprene Coupling Washer, Set of 6 Also: Kegerator Tips & Gear | Keg Repair Part #s | 5 Recent Keg Finds