Sanitary Hatch Cover A 4" Sanitary Hatch Cover, Foot operated, quick opening designed primarily for waste disposal of campers and travel trailers at dump stations. The non-recessed design provides straight-through flow to eliminate entrapment of waste material. Made of Ductile Iron. Can be locked to prevent dumping without your authorization.  Select Image for Closer Viewing   The Tower Company, Inc. P.O. Box 1958 Manitowoc, WI 54221-1958 1-800-945-1532 or 1-(920) 682-6091 Fax: 1(920) 682-6094