Artificial Rock Cover for Flat Septic Lid. This flat artificial rock covers standard sized 24" diameter septic lids and also may be used as a "skinmmer" cover rock for watergarden equipment. The rock is lightweight and durable. Made from recyclable materials that will not fade in the sun or crack in cold weather. Made in the USA. Optional ground stake install system included. Dimensions: 31" L x 27" W x 6" H Weight: 6 lbs.