This dirt cup door is designed to fit the dust cap to create an air tight seal between two parts. It is made of clear plastic with rubber seals and it is sold individually.
Part number: 203-1299 For Bissell
Compatible with Bissell models: 6405,
5770,
5990,
6100,
5770-5,
5770-8,
5770-P,
5770-H,