RealRock™ Boulders are ideal for concealing air pumps, water pumps, pond filters, ultraviolet clarifiers, lighting transformers and other equipment. These commercial-grade faux stones are weather-resistant, durable, lightweight and easy to move. The color and texture is part of material, not painted on, so it will not fade or crack. Made of recycled material. Includes vent, additional vents available by special order SKU Dimensions Color Vent Recommended Use Wt DMBR 19"L x 14"W x 12"H Brown 3" Linear compressors, MC6-ML80 4lb DLB1F 30"L x 23"W x 18"H Gray 3" Compressors up to PA66 Small Pond Filters 6lb DLB1R Brown DLB2F* 56"L x 42"W x 30"H Gray 4" Compressors PA75 or larger Multiple compressors 28lb DLB2R* Brown *Ships by truck freight, which requires that you be present at time of delivery. Freight company will call to schedule an appointment.