Surfaces of equipment not intended for contact with food, but which are exposed to splash or food debris or which otherwise require frequent cleaning, shall be designed and fabricated to be smooth, washable, free of unnecessary ledges, projections, or crevices, and readily accessible for cleaning and shall be of such material and in such repair as to be easily maintained in a clean and sanitary condition. Surfaces of product module display units, tethers and all display equipment not intended for food contact, but which are exposed to splash, food debris or other soiling, shall be designed and fabricated to be smooth, cleanable, durable under conditions of normal use and free of unnecessary ledges, projections or crevices. Tethers shall be designed to be easily removable from the product module for cleaning. The materials for nonfood-contact surfaces shall be nonabsorbent or made nonabsorbent by being finished and sealed with a cleanable coating.