Couplings other than those referred to in point (a), as well as couplings that are retrofitted, shall be type-approved in accordance with UN Regulation No 55.
Déanfar cúpláin, seachas na cúpláin dá dtagraítear i bpointe (a), agus cúpláin a iarfheistítear, déanfar iad a chineálcheadú i gcomhréir le Rialachán Uimh. 55 de chuid NA.