A blue rectangular dome. It fits the following JE Adams vacuums: (28000, 28001, 28002, 28003). Oval units are (8940, 8940VR, 8930, 8930VR). Dual units are (8960, 8970, 8960-C, 8960-220, 8960C220). The dimensions are: 30" L X 19.9" W X 13.5 H.