retainer element 16 retainer element 80 is coupled to housing 14 by inserting legs 82 into apertures 36a and 36b and out through apertures 36c and 36d as legs 82 are being inserted annular members 86 deflect outwardly to permit their translation around the outside surface of housing 14 when the retainer element is inserted barbs 88 will extend inwardly into apertures 36c and 36d to lock the retainer element in place handles 90 are used to assist the removal of retainer element 80 from housing 14 which is achieved by deflecting annular member 86 outwardly to disengage barbs 88 from the appertures and lifting the retainer element out from the housing referring to fig6 a fourth embodiment of a retainer element 94 is shown again retainer element may be used with housing 14 and is made from a resilient material retainer element 94 is comprised of a pair of generally parallel elongated legs 96 joined at one end by a cross member 98 legs 96 are each formed with an inwardly extending barb 100 and a lead area 102 similar in shape to lead area 42 of retainer element 16 retainer element 94 is coupled to housing 14 by deflecting legs 96 outwardly a sufficient distance to permit their insertion into apertures 36a and 36b and out through apertures 36c and 36d when fully inserted barbs 100 engage the lower lateral edges of apertures 36c and 36d to lock retainer element 94 in place referring to fig7 and 8 retainer element 94 is shown coupled to a housing 104 similar in construction to housing 14 fig7 is a front elevation view and fig8 is a side elevation view.