distal end for connecting sensor 126 with an appropriate control system of the machine as seen in fig4 and 7 the conductors 148 associated with sensors 126 of all of the outlet modules 54 of distribution head 42 exit from the lower halves 54 b of modules 54 below support plate 56 they then lead generally radially inwardly from modules 54 toward upright conduit 38 and pass over the upper edge of a bowl shaped housing 152 that is spaced a short distance below support plate 56 the free ends of sensor conductors 148 having connectors 150 thereon are enclosed within housing 152 where they may be joined with leads 154 from the control system of the seeder thus housing 152 provides a protective compartment 156 within which sensor conductors 148 connectors 150 and leads 154 may be contained one or more holes 158 may be provided in the bottom of housing 152 through which leads 154 may be trained housing 152 is retained on conduit 38 by any suitable means such as for example a ring 158 fig4 and 7 fixed to conduit 38 below a larger diameter opening 160 in the bottom of housing 152 and a removable spring clip 162 that embraces conduit 38 above ring 158 and below the bottom of housing 152 a petal shaped plate 164 see also fig5 of larger diameter than opening 160 may be fixed to conduit 38 a short distance above ring 158 to overlie and engage the top side of the housing bottom and.