An insulating body is captively secured on the housing for a plug connection having insulation displacement terminals. The insulating body is held on guide of the housing in a rotatable manner and in an insertable manner into the housing via an opening. The guide can be formed as slits that lie in lateral parts of the housing. The lateral parts project beyond the housing. Electric conductors can be inserted into the insulating body on a rear surface, plugged through said body, and cut on a front surface. The electric conductors are thus brought to the intended length before the insulating body is inserted into the housing.