Has anyone dealt with BENCO dental equuipment before? We are trying to rough in for the chairs in the slab at a dental office. The only detail I have is a picture of a 4" square mouted sideways on top of their supplied floor box, with a whip going into a hole in the top of the box. They call the whip "flex wire". I am getting no where with the rep. Wondering how to bring my rigid into this box and term it.