This red dust cover assembly (part 53.060R) fits the Fuller Brush FBMM4-PW.4 upright vacuum and includes the integrated latch. The dust cover closes the filter or bag compartment and the latch holds it sealed during use. Replace when the cover cracks, the latch fails to hold, or the cover no longer seals the compartment. Confirm the FBMM4-PW.4 model designation before ordering.