6 products Ringfeder® hook coupling RUwg (ECE) This is a series of automatic hook-type couplings intended for special applications. These couplings are available in different flange sizes and should be used with toroidal drawbar eyes only. Standar... Ringfeder® hook coupling RUWG K0E This is a non-automatic hook-type coupling for special applications and should be used with toroidal drawbar eyes only. Standard VG 74059 compliant. Ringfeder® hook coupling RU K5 DV Automatic hook-type coupling for toroidal drawbar eyes. Standard VG 74059 compliant. Ringfeder® hook coupling 663 (ECE) Automatic hook-type coupling for toroidal drawbar eyes. Standard VG 74059 compliant. Ringfeder® hook coupling 663 Automatic hook-type coupling for toroidal drawbar eyes. (without type approval) Ringfeder® hook coupling 65 Non-automatic hook-type coupling for toroidal drawbar eyes. Available for G/125, G/135, G/140, and G/150. Standard VG 74059 compliant. This coupling is not ECE type approved.