Dekorra Fake Rock Well Cover Model 102 Fieldstone Durable - UV protected will not fade in the sun or crack in cold weather. Ideal Applications: Residential backflow assemblies 3/4" - 1"; Septic vent pipes up to 24"H; Water well casings up to 24"H; Small pumps, compressors and blowers. Keep in mind, colors will vary a bit from one rock to the next. Overall Size: 25"H x 21"W x 27"D (See inner dimensions on chart in image as rocks taper) Simulates natural stone which provides an extremely realistic appearance.