Univen Rubber O-ring Gasket 13281207/BL5000-08/1000000013 fits Black & Decker Blenders Univen Rubber Gasket Fits Black & Decker Fits Black & Decker Blender Models BL1900, BL1900R, BL2900, BL3900SKT Fits Black & Decker Blender Models BL4900, BL5000, BL9000, BLKT5950C 2"(25.4mm) inside diameter, and 2.63"(66.8mm) outside diameter. Package of one gasket