The TOPS T-264 Sanitary Tank Hatch threads onto the fill pipe of an underground sanitary waste disposal tank. The T-264 is foot-operated and quick opening/closing for clean emptying of sanitary waste from RVs, campers and travel trailers. The non-recessed design provides straight-through flow to eliminate entrapment of waste materials. The body is made of ductile iron for superior impact and fatigue resistance.